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builtins.go
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// Copyright 2015 The Cockroach Authors.
//
// Use of this software is governed by the Business Source License
// included in the file licenses/BSL.txt.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0, included in the file
// licenses/APL.txt.
package builtins
import (
"bytes"
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
gojson "encoding/json"
"fmt"
"hash"
"hash/crc32"
"hash/fnv"
"math"
"math/rand"
"net"
"regexp/syntax"
"strconv"
"strings"
"time"
"unicode"
"unicode/utf8"
"github.com/cockroachdb/cockroach/pkg/base"
"github.com/cockroachdb/cockroach/pkg/build"
"github.com/cockroachdb/cockroach/pkg/clusterversion"
"github.com/cockroachdb/cockroach/pkg/config/zonepb"
"github.com/cockroachdb/cockroach/pkg/keys"
"github.com/cockroachdb/cockroach/pkg/kv"
"github.com/cockroachdb/cockroach/pkg/roachpb"
"github.com/cockroachdb/cockroach/pkg/server/telemetry"
"github.com/cockroachdb/cockroach/pkg/settings/cluster"
"github.com/cockroachdb/cockroach/pkg/sql/catalog"
"github.com/cockroachdb/cockroach/pkg/sql/catalog/catalogkeys"
"github.com/cockroachdb/cockroach/pkg/sql/catalog/catalogkv"
"github.com/cockroachdb/cockroach/pkg/sql/catalog/descpb"
"github.com/cockroachdb/cockroach/pkg/sql/lex"
"github.com/cockroachdb/cockroach/pkg/sql/lexbase"
"github.com/cockroachdb/cockroach/pkg/sql/parser"
"github.com/cockroachdb/cockroach/pkg/sql/pgwire/pgcode"
"github.com/cockroachdb/cockroach/pkg/sql/pgwire/pgerror"
"github.com/cockroachdb/cockroach/pkg/sql/pgwire/pgnotice"
"github.com/cockroachdb/cockroach/pkg/sql/protoreflect"
"github.com/cockroachdb/cockroach/pkg/sql/roleoption"
"github.com/cockroachdb/cockroach/pkg/sql/rowenc"
"github.com/cockroachdb/cockroach/pkg/sql/sem/tree"
"github.com/cockroachdb/cockroach/pkg/sql/sessiondata"
"github.com/cockroachdb/cockroach/pkg/sql/sessiondatapb"
"github.com/cockroachdb/cockroach/pkg/sql/sqlliveness"
"github.com/cockroachdb/cockroach/pkg/sql/sqltelemetry"
"github.com/cockroachdb/cockroach/pkg/sql/sqlutil"
"github.com/cockroachdb/cockroach/pkg/sql/types"
"github.com/cockroachdb/cockroach/pkg/streaming"
"github.com/cockroachdb/cockroach/pkg/util/duration"
"github.com/cockroachdb/cockroach/pkg/util/fuzzystrmatch"
"github.com/cockroachdb/cockroach/pkg/util/hlc"
"github.com/cockroachdb/cockroach/pkg/util/humanizeutil"
"github.com/cockroachdb/cockroach/pkg/util/ipaddr"
"github.com/cockroachdb/cockroach/pkg/util/json"
"github.com/cockroachdb/cockroach/pkg/util/log"
"github.com/cockroachdb/cockroach/pkg/util/timeofday"
"github.com/cockroachdb/cockroach/pkg/util/timetz"
"github.com/cockroachdb/cockroach/pkg/util/timeutil"
"github.com/cockroachdb/cockroach/pkg/util/tracing"
"github.com/cockroachdb/cockroach/pkg/util/unaccent"
"github.com/cockroachdb/cockroach/pkg/util/uuid"
"github.com/cockroachdb/errors"
"github.com/knz/strtime"
)
var (
errEmptyInputString = pgerror.New(pgcode.InvalidParameterValue, "the input string must not be empty")
errZeroIP = pgerror.New(pgcode.InvalidParameterValue, "zero length IP")
errChrValueTooSmall = pgerror.New(pgcode.InvalidParameterValue, "input value must be >= 0")
errChrValueTooLarge = pgerror.Newf(pgcode.InvalidParameterValue,
"input value must be <= %d (maximum Unicode code point)", utf8.MaxRune)
errStringTooLarge = pgerror.Newf(pgcode.ProgramLimitExceeded,
"requested length too large, exceeds %s", humanizeutil.IBytes(maxAllocatedStringSize))
errInvalidNull = pgerror.New(pgcode.InvalidParameterValue, "input cannot be NULL")
// SequenceNameArg represents the name of sequence (string) arguments in
// builtin functions.
SequenceNameArg = "sequence_name"
)
const defaultFollowerReadDuration = -4800 * time.Millisecond
const maxAllocatedStringSize = 128 * 1024 * 1024
const errInsufficientArgsFmtString = "unknown signature: %s()"
const (
categoryArray = "Array"
categoryComparison = "Comparison"
categoryCompatibility = "Compatibility"
categoryDateAndTime = "Date and time"
categoryEnum = "Enum"
categoryFullTextSearch = "Full Text Search"
categoryGenerator = "Set-returning"
categoryTrigram = "Trigrams"
categoryFuzzyStringMatching = "Fuzzy String Matching"
categoryIDGeneration = "ID generation"
categoryJSON = "JSONB"
categoryMultiRegion = "Multi-region"
categoryMultiTenancy = "Multi-tenancy"
categorySequences = "Sequence"
categorySpatial = "Spatial"
categoryString = "String and byte"
categorySystemInfo = "System info"
categorySystemRepair = "System repair"
categoryStreamIngestion = "Stream Ingestion"
)
func categorizeType(t *types.T) string {
switch t.Family() {
case types.DateFamily, types.IntervalFamily, types.TimestampFamily, types.TimestampTZFamily:
return categoryDateAndTime
case types.StringFamily, types.BytesFamily:
return categoryString
default:
return strings.ToUpper(t.String())
}
}
const (
// GatewayRegionBuiltinName is the name for the builtin that returns the gateway
// region of the current node.
GatewayRegionBuiltinName = "gateway_region"
// DefaultToDatabasePrimaryRegionBuiltinName is the name for the builtin that
// takes in a region and returns it if it is a valid region on the database.
// Otherwise, it returns the primary region.
DefaultToDatabasePrimaryRegionBuiltinName = "default_to_database_primary_region"
)
var digitNames = [...]string{"zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"}
const regexpFlagInfo = `
CockroachDB supports the following flags:
| Flag | Description |
|----------------|-------------------------------------------------------------------|
| **c** | Case-sensitive matching |
| **g** | Global matching (match each substring instead of only the first) |
| **i** | Case-insensitive matching |
| **m** or **n** | Newline-sensitive (see below) |
| **p** | Partial newline-sensitive matching (see below) |
| **s** | Newline-insensitive (default) |
| **w** | Inverse partial newline-sensitive matching (see below) |
| Mode | ` + "`.` and `[^...]` match newlines | `^` and `$` match line boundaries" + `|
|------|----------------------------------|--------------------------------------|
| s | yes | no |
| w | yes | yes |
| p | no | no |
| m/n | no | yes |`
// builtinDefinition represents a built-in function before it becomes
// a tree.FunctionDefinition.
type builtinDefinition struct {
props tree.FunctionProperties
overloads []tree.Overload
}
// GetBuiltinProperties provides low-level access to a built-in function's properties.
// For a better, semantic-rich interface consider using tree.FunctionDefinition
// instead, and resolve function names via ResolvableFunctionReference.Resolve().
func GetBuiltinProperties(name string) (*tree.FunctionProperties, []tree.Overload) {
def, ok := builtins[name]
if !ok {
return nil, nil
}
return &def.props, def.overloads
}
// defProps is used below to define built-in functions with default properties.
func defProps() tree.FunctionProperties { return tree.FunctionProperties{} }
// arrayProps is used below for array functions.
func arrayProps() tree.FunctionProperties { return tree.FunctionProperties{Category: categoryArray} }
// arrayPropsNullableArgs is used below for array functions that accept NULLs as arguments.
func arrayPropsNullableArgs() tree.FunctionProperties {
p := arrayProps()
p.NullableArgs = true
return p
}
func makeBuiltin(props tree.FunctionProperties, overloads ...tree.Overload) builtinDefinition {
return builtinDefinition{
props: props,
overloads: overloads,
}
}
func newDecodeError(enc string) error {
return pgerror.Newf(pgcode.CharacterNotInRepertoire,
"invalid byte sequence for encoding %q", enc)
}
func newEncodeError(c rune, enc string) error {
return pgerror.Newf(pgcode.UntranslatableCharacter,
"character %q has no representation in encoding %q", c, enc)
}
// builtins contains the built-in functions indexed by name.
//
// For use in other packages, see AllBuiltinNames and GetBuiltinProperties().
var builtins = map[string]builtinDefinition{
// TODO(XisiHuang): support encoding, i.e., length(str, encoding).
"length": lengthImpls(true /* includeBitOverload */),
"char_length": lengthImpls(false /* includeBitOverload */),
"character_length": lengthImpls(false /* includeBitOverload */),
"bit_length": makeBuiltin(tree.FunctionProperties{Category: categoryString},
stringOverload1(
func(_ *tree.EvalContext, s string) (tree.Datum, error) {
return tree.NewDInt(tree.DInt(len(s) * 8)), nil
},
types.Int,
"Calculates the number of bits used to represent `val`.",
tree.VolatilityImmutable,
),
bytesOverload1(
func(_ *tree.EvalContext, s string) (tree.Datum, error) {
return tree.NewDInt(tree.DInt(len(s) * 8)), nil
},
types.Int,
"Calculates the number of bits used to represent `val`.",
tree.VolatilityImmutable,
),
bitsOverload1(
func(_ *tree.EvalContext, s *tree.DBitArray) (tree.Datum, error) {
return tree.NewDInt(tree.DInt(s.BitArray.BitLen())), nil
},
types.Int,
"Calculates the number of bits used to represent `val`.",
tree.VolatilityImmutable,
),
),
"octet_length": makeBuiltin(tree.FunctionProperties{Category: categoryString},
stringOverload1(
func(_ *tree.EvalContext, s string) (tree.Datum, error) {
return tree.NewDInt(tree.DInt(len(s))), nil
},
types.Int,
"Calculates the number of bytes used to represent `val`.",
tree.VolatilityImmutable,
),
bytesOverload1(
func(_ *tree.EvalContext, s string) (tree.Datum, error) {
return tree.NewDInt(tree.DInt(len(s))), nil
},
types.Int,
"Calculates the number of bytes used to represent `val`.",
tree.VolatilityImmutable,
),
bitsOverload1(
func(_ *tree.EvalContext, s *tree.DBitArray) (tree.Datum, error) {
return tree.NewDInt(tree.DInt((s.BitArray.BitLen() + 7) / 8)), nil
},
types.Int,
"Calculates the number of bits used to represent `val`.",
tree.VolatilityImmutable,
),
),
// TODO(pmattis): What string functions should also support types.Bytes?
"lower": makeBuiltin(tree.FunctionProperties{Category: categoryString},
stringOverload1(
func(evalCtx *tree.EvalContext, s string) (tree.Datum, error) {
return tree.NewDString(strings.ToLower(s)), nil
},
types.String,
"Converts all characters in `val` to their lower-case equivalents.",
tree.VolatilityImmutable,
),
),
"unaccent": makeBuiltin(tree.FunctionProperties{Category: categoryString},
stringOverload1(
func(evalCtx *tree.EvalContext, s string) (tree.Datum, error) {
var b strings.Builder
for _, ch := range s {
v, ok := unaccent.Dictionary[ch]
if ok {
b.WriteString(v)
} else {
b.WriteRune(ch)
}
}
return tree.NewDString(b.String()), nil
},
types.String,
"Removes accents (diacritic signs) from the text provided in `val`.",
tree.VolatilityImmutable,
),
),
"upper": makeBuiltin(tree.FunctionProperties{Category: categoryString},
stringOverload1(
func(evalCtx *tree.EvalContext, s string) (tree.Datum, error) {
return tree.NewDString(strings.ToUpper(s)), nil
},
types.String,
"Converts all characters in `val` to their to their upper-case equivalents.",
tree.VolatilityImmutable,
),
),
"substr": substringImpls,
"substring": substringImpls,
// concat concatenates the text representations of all the arguments.
// NULL arguments are ignored.
"concat": makeBuiltin(
tree.FunctionProperties{
NullableArgs: true,
},
tree.Overload{
Types: tree.VariadicType{VarType: types.String},
ReturnType: tree.FixedReturnType(types.String),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
var buffer bytes.Buffer
length := 0
for _, d := range args {
if d == tree.DNull {
continue
}
length += len(string(tree.MustBeDString(d)))
if length > maxAllocatedStringSize {
return nil, errStringTooLarge
}
buffer.WriteString(string(tree.MustBeDString(d)))
}
return tree.NewDString(buffer.String()), nil
},
Info: "Concatenates a comma-separated list of strings.",
Volatility: tree.VolatilityImmutable,
// In Postgres concat can take any arguments, converting them to
// their text representation. Since the text representation can
// depend on the context (e.g. timezone), the function is Stable. In
// our case, we only take String inputs so our version is ImmutableCopy.
IgnoreVolatilityCheck: true,
},
),
"concat_ws": makeBuiltin(
tree.FunctionProperties{
NullableArgs: true,
},
tree.Overload{
Types: tree.VariadicType{VarType: types.String},
ReturnType: tree.FixedReturnType(types.String),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
if len(args) == 0 {
return nil, pgerror.Newf(pgcode.UndefinedFunction, errInsufficientArgsFmtString, "concat_ws")
}
if args[0] == tree.DNull {
return tree.DNull, nil
}
sep := string(tree.MustBeDString(args[0]))
var buf bytes.Buffer
prefix := ""
length := 0
for _, d := range args[1:] {
if d == tree.DNull {
continue
}
length += len(prefix) + len(string(tree.MustBeDString(d)))
if length > maxAllocatedStringSize {
return nil, errStringTooLarge
}
// Note: we can't use the range index here because that
// would break when the 2nd argument is NULL.
buf.WriteString(prefix)
prefix = sep
buf.WriteString(string(tree.MustBeDString(d)))
}
return tree.NewDString(buf.String()), nil
},
Info: "Uses the first argument as a separator between the concatenation of the " +
"subsequent arguments. \n\nFor example `concat_ws('!','wow','great')` " +
"returns `wow!great`.",
Volatility: tree.VolatilityImmutable,
// In Postgres concat_ws can take any arguments, converting them to
// their text representation. Since the text representation can
// depend on the context (e.g. timezone), the function is Stable. In
// our case, we only take String inputs so our version is ImmutableCopy.
IgnoreVolatilityCheck: true,
},
),
// https://www.postgresql.org/docs/10/static/functions-string.html#FUNCTIONS-STRING-OTHER
"convert_from": makeBuiltin(tree.FunctionProperties{Category: categoryString},
tree.Overload{
Types: tree.ArgTypes{{"str", types.Bytes}, {"enc", types.String}},
ReturnType: tree.FixedReturnType(types.String),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
str := []byte(tree.MustBeDBytes(args[0]))
enc := CleanEncodingName(string(tree.MustBeDString(args[1])))
switch enc {
// All the following are aliases to each other in PostgreSQL.
case "utf8", "unicode", "cp65001":
if !utf8.Valid(str) {
return nil, newDecodeError("UTF8")
}
return tree.NewDString(string(str)), nil
// All the following are aliases to each other in PostgreSQL.
case "latin1", "iso88591", "cp28591":
var buf strings.Builder
for _, c := range str {
buf.WriteRune(rune(c))
}
return tree.NewDString(buf.String()), nil
}
return nil, pgerror.Newf(pgcode.InvalidParameterValue,
"invalid source encoding name %q", enc)
},
Info: "Decode the bytes in `str` into a string using encoding `enc`. " +
"Supports encodings 'UTF8' and 'LATIN1'.",
Volatility: tree.VolatilityImmutable,
IgnoreVolatilityCheck: true,
}),
// https://www.postgresql.org/docs/10/static/functions-string.html#FUNCTIONS-STRING-OTHER
"convert_to": makeBuiltin(tree.FunctionProperties{Category: categoryString},
tree.Overload{
Types: tree.ArgTypes{{"str", types.String}, {"enc", types.String}},
ReturnType: tree.FixedReturnType(types.Bytes),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
str := string(tree.MustBeDString(args[0]))
enc := CleanEncodingName(string(tree.MustBeDString(args[1])))
switch enc {
// All the following are aliases to each other in PostgreSQL.
case "utf8", "unicode", "cp65001":
return tree.NewDBytes(tree.DBytes([]byte(str))), nil
// All the following are aliases to each other in PostgreSQL.
case "latin1", "iso88591", "cp28591":
res := make([]byte, 0, len(str))
for _, c := range str {
if c > 255 {
return nil, newEncodeError(c, "LATIN1")
}
res = append(res, byte(c))
}
return tree.NewDBytes(tree.DBytes(res)), nil
}
return nil, pgerror.Newf(pgcode.InvalidParameterValue,
"invalid destination encoding name %q", enc)
},
Info: "Encode the string `str` as a byte array using encoding `enc`. " +
"Supports encodings 'UTF8' and 'LATIN1'.",
Volatility: tree.VolatilityImmutable,
IgnoreVolatilityCheck: true,
}),
// https://www.postgresql.org/docs/9.0/functions-binarystring.html#FUNCTIONS-BINARYSTRING-OTHER
"get_bit": makeBuiltin(tree.FunctionProperties{Category: categoryString},
tree.Overload{
Types: tree.ArgTypes{{"bit_string", types.VarBit}, {"index", types.Int}},
ReturnType: tree.FixedReturnType(types.Int),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
bitString := tree.MustBeDBitArray(args[0])
index := int(tree.MustBeDInt(args[1]))
bit, err := bitString.GetBitAtIndex(index)
if err != nil {
return nil, err
}
return tree.NewDInt(tree.DInt(bit)), nil
},
Info: "Extracts a bit at given index in the bit array.",
Volatility: tree.VolatilityImmutable,
},
tree.Overload{
Types: tree.ArgTypes{{"byte_string", types.Bytes}, {"index", types.Int}},
ReturnType: tree.FixedReturnType(types.Int),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
byteString := []byte(*args[0].(*tree.DBytes))
index := int(tree.MustBeDInt(args[1]))
// Check whether index asked is inside ByteArray.
if index < 0 || index >= 8*len(byteString) {
return nil, pgerror.Newf(pgcode.ArraySubscript,
"bit index %d out of valid range (0..%d)", index, 8*len(byteString)-1)
}
// To extract a bit at the given index, we have to determine the
// position within byte array, i.e. index/8 after that checked
// the bit at residual index.
if byteString[index/8]&(byte(1)<<(8-1-byte(index)%8)) != 0 {
return tree.NewDInt(tree.DInt(1)), nil
}
return tree.NewDInt(tree.DInt(0)), nil
},
Info: "Extracts a bit at given index in the byte array.",
Volatility: tree.VolatilityImmutable,
}),
// https://www.postgresql.org/docs/9.0/functions-binarystring.html#FUNCTIONS-BINARYSTRING-OTHER
"set_bit": makeBuiltin(tree.FunctionProperties{Category: categoryString},
tree.Overload{
Types: tree.ArgTypes{
{"bit_string", types.VarBit},
{"index", types.Int},
{"to_set", types.Int},
},
ReturnType: tree.FixedReturnType(types.VarBit),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
bitString := tree.MustBeDBitArray(args[0])
index := int(tree.MustBeDInt(args[1]))
toSet := int(tree.MustBeDInt(args[2]))
// Value of bit can only be set to 1 or 0.
if toSet != 0 && toSet != 1 {
return nil, pgerror.Newf(pgcode.InvalidParameterValue,
"new bit must be 0 or 1.")
}
updatedBitString, err := bitString.SetBitAtIndex(index, toSet)
if err != nil {
return nil, err
}
return &tree.DBitArray{BitArray: updatedBitString}, nil
},
Info: "Updates a bit at given index in the bit array.",
Volatility: tree.VolatilityImmutable,
},
tree.Overload{
Types: tree.ArgTypes{
{"byte_string", types.Bytes},
{"index", types.Int},
{"to_set", types.Int},
},
ReturnType: tree.FixedReturnType(types.Bytes),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
byteString := []byte(*args[0].(*tree.DBytes))
index := int(tree.MustBeDInt(args[1]))
toSet := int(tree.MustBeDInt(args[2]))
// Value of bit can only be set to 1 or 0.
if toSet != 0 && toSet != 1 {
return nil, pgerror.Newf(pgcode.InvalidParameterValue,
"new bit must be 0 or 1.")
}
// Check whether index asked is inside ByteArray.
if index < 0 || index >= 8*len(byteString) {
return nil, pgerror.Newf(pgcode.ArraySubscript,
"bit index %d out of valid range (0..%d)", index, 8*len(byteString)-1)
}
// To update a bit at the given index, we have to determine the
// position within byte array, i.e. index/8 after that checked
// the bit at residual index.
// Forcefully making bit at the index to 0.
byteString[index/8] &= ^(byte(1) << (8 - 1 - byte(index)%8))
// Updating value at the index to toSet.
byteString[index/8] |= byte(toSet) << (8 - 1 - byte(index)%8)
return tree.NewDBytes(tree.DBytes(byteString)), nil
},
Info: "Updates a bit at given index in the byte array.",
Volatility: tree.VolatilityImmutable,
}),
"gen_random_uuid": generateRandomUUIDImpl,
"uuid_generate_v4": generateRandomUUIDImpl,
"to_uuid": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{{"val", types.String}},
ReturnType: tree.FixedReturnType(types.Bytes),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
s := string(tree.MustBeDString(args[0]))
uv, err := uuid.FromString(s)
if err != nil {
return nil, err
}
return tree.NewDBytes(tree.DBytes(uv.GetBytes())), nil
},
Info: "Converts the character string representation of a UUID to its byte string " +
"representation.",
Volatility: tree.VolatilityImmutable,
},
),
"from_uuid": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{{"val", types.Bytes}},
ReturnType: tree.FixedReturnType(types.String),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
b := []byte(*args[0].(*tree.DBytes))
uv, err := uuid.FromBytes(b)
if err != nil {
return nil, err
}
return tree.NewDString(uv.String()), nil
},
Info: "Converts the byte string representation of a UUID to its character string " +
"representation.",
Volatility: tree.VolatilityImmutable,
},
),
// The following functions are all part of the NET address functions. They can
// be found in the postgres reference at https://www.postgresql.org/docs/9.6/static/functions-net.html#CIDR-INET-FUNCTIONS-TABLE
// This includes:
// - abbrev
// - broadcast
// - family
// - host
// - hostmask
// - masklen
// - netmask
// - set_masklen
// - text(inet)
// - inet_same_family
"abbrev": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{{"val", types.INet}},
ReturnType: tree.FixedReturnType(types.String),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
dIPAddr := tree.MustBeDIPAddr(args[0])
return tree.NewDString(dIPAddr.IPAddr.String()), nil
},
Info: "Converts the combined IP address and prefix length to an abbreviated display format as text." +
"For INET types, this will omit the prefix length if it's not the default (32 or IPv4, 128 for IPv6)" +
"\n\nFor example, `abbrev('192.168.1.2/24')` returns `'192.168.1.2/24'`",
Volatility: tree.VolatilityImmutable,
},
),
"broadcast": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{{"val", types.INet}},
ReturnType: tree.FixedReturnType(types.INet),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
dIPAddr := tree.MustBeDIPAddr(args[0])
broadcastIPAddr := dIPAddr.IPAddr.Broadcast()
return &tree.DIPAddr{IPAddr: broadcastIPAddr}, nil
},
Info: "Gets the broadcast address for the network address represented by the value." +
"\n\nFor example, `broadcast('192.168.1.2/24')` returns `'192.168.1.255/24'`",
Volatility: tree.VolatilityImmutable,
},
),
"family": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{{"val", types.INet}},
ReturnType: tree.FixedReturnType(types.Int),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
dIPAddr := tree.MustBeDIPAddr(args[0])
if dIPAddr.Family == ipaddr.IPv4family {
return tree.NewDInt(tree.DInt(4)), nil
}
return tree.NewDInt(tree.DInt(6)), nil
},
Info: "Extracts the IP family of the value; 4 for IPv4, 6 for IPv6." +
"\n\nFor example, `family('::1')` returns `6`",
Volatility: tree.VolatilityImmutable,
},
),
"host": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{{"val", types.INet}},
ReturnType: tree.FixedReturnType(types.String),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
dIPAddr := tree.MustBeDIPAddr(args[0])
s := dIPAddr.IPAddr.String()
if i := strings.IndexByte(s, '/'); i != -1 {
return tree.NewDString(s[:i]), nil
}
return tree.NewDString(s), nil
},
Info: "Extracts the address part of the combined address/prefixlen value as text." +
"\n\nFor example, `host('192.168.1.2/16')` returns `'192.168.1.2'`",
Volatility: tree.VolatilityImmutable,
},
),
"hostmask": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{{"val", types.INet}},
ReturnType: tree.FixedReturnType(types.INet),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
dIPAddr := tree.MustBeDIPAddr(args[0])
ipAddr := dIPAddr.IPAddr.Hostmask()
return &tree.DIPAddr{IPAddr: ipAddr}, nil
},
Info: "Creates an IP host mask corresponding to the prefix length in the value." +
"\n\nFor example, `hostmask('192.168.1.2/16')` returns `'0.0.255.255'`",
Volatility: tree.VolatilityImmutable,
},
),
"masklen": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{{"val", types.INet}},
ReturnType: tree.FixedReturnType(types.Int),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
dIPAddr := tree.MustBeDIPAddr(args[0])
return tree.NewDInt(tree.DInt(dIPAddr.Mask)), nil
},
Info: "Retrieves the prefix length stored in the value." +
"\n\nFor example, `masklen('192.168.1.2/16')` returns `16`",
Volatility: tree.VolatilityImmutable,
},
),
"netmask": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{{"val", types.INet}},
ReturnType: tree.FixedReturnType(types.INet),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
dIPAddr := tree.MustBeDIPAddr(args[0])
ipAddr := dIPAddr.IPAddr.Netmask()
return &tree.DIPAddr{IPAddr: ipAddr}, nil
},
Info: "Creates an IP network mask corresponding to the prefix length in the value." +
"\n\nFor example, `netmask('192.168.1.2/16')` returns `'255.255.0.0'`",
Volatility: tree.VolatilityImmutable,
},
),
"set_masklen": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{
{"val", types.INet},
{"prefixlen", types.Int},
},
ReturnType: tree.FixedReturnType(types.INet),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
dIPAddr := tree.MustBeDIPAddr(args[0])
mask := int(tree.MustBeDInt(args[1]))
if !(dIPAddr.Family == ipaddr.IPv4family && mask >= 0 && mask <= 32) && !(dIPAddr.Family == ipaddr.IPv6family && mask >= 0 && mask <= 128) {
return nil, pgerror.Newf(
pgcode.InvalidParameterValue, "invalid mask length: %d", mask)
}
return &tree.DIPAddr{IPAddr: ipaddr.IPAddr{Family: dIPAddr.Family, Addr: dIPAddr.Addr, Mask: byte(mask)}}, nil
},
Info: "Sets the prefix length of `val` to `prefixlen`.\n\n" +
"For example, `set_masklen('192.168.1.2', 16)` returns `'192.168.1.2/16'`.",
Volatility: tree.VolatilityImmutable,
},
),
"text": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{{"val", types.INet}},
ReturnType: tree.FixedReturnType(types.String),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
dIPAddr := tree.MustBeDIPAddr(args[0])
s := dIPAddr.IPAddr.String()
// Ensure the string has a "/mask" suffix.
if strings.IndexByte(s, '/') == -1 {
s += "/" + strconv.Itoa(int(dIPAddr.Mask))
}
return tree.NewDString(s), nil
},
Info: "Converts the IP address and prefix length to text.",
Volatility: tree.VolatilityImmutable,
},
),
"inet_same_family": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{
{"val", types.INet},
{"val", types.INet},
},
ReturnType: tree.FixedReturnType(types.Bool),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
first := tree.MustBeDIPAddr(args[0])
other := tree.MustBeDIPAddr(args[1])
return tree.MakeDBool(tree.DBool(first.Family == other.Family)), nil
},
Info: "Checks if two IP addresses are of the same IP family.",
Volatility: tree.VolatilityImmutable,
},
),
"inet_contained_by_or_equals": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{
{"val", types.INet},
{"container", types.INet},
},
ReturnType: tree.FixedReturnType(types.Bool),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
ipAddr := tree.MustBeDIPAddr(args[0]).IPAddr
other := tree.MustBeDIPAddr(args[1]).IPAddr
return tree.MakeDBool(tree.DBool(ipAddr.ContainedByOrEquals(&other))), nil
},
Info: "Test for subnet inclusion or equality, using only the network parts of the addresses. " +
"The host part of the addresses is ignored.",
Volatility: tree.VolatilityImmutable,
},
),
"inet_contains_or_equals": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{
{"container", types.INet},
{"val", types.INet},
},
ReturnType: tree.FixedReturnType(types.Bool),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
ipAddr := tree.MustBeDIPAddr(args[0]).IPAddr
other := tree.MustBeDIPAddr(args[1]).IPAddr
return tree.MakeDBool(tree.DBool(ipAddr.ContainsOrEquals(&other))), nil
},
Info: "Test for subnet inclusion or equality, using only the network parts of the addresses. " +
"The host part of the addresses is ignored.",
Volatility: tree.VolatilityImmutable,
},
),
"from_ip": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{{"val", types.Bytes}},
ReturnType: tree.FixedReturnType(types.String),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
ipstr := args[0].(*tree.DBytes)
nboip := net.IP(*ipstr)
sv := nboip.String()
// if nboip has a length of 0, sv will be "<nil>"
if sv == "<nil>" {
return nil, errZeroIP
}
return tree.NewDString(sv), nil
},
Info: "Converts the byte string representation of an IP to its character string " +
"representation.",
Volatility: tree.VolatilityImmutable,
},
),
"to_ip": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{{"val", types.String}},
ReturnType: tree.FixedReturnType(types.Bytes),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
ipdstr := tree.MustBeDString(args[0])
ip := net.ParseIP(string(ipdstr))
// If ipdstr could not be parsed to a valid IP,
// ip will be nil.
if ip == nil {
return nil, pgerror.Newf(
pgcode.InvalidParameterValue, "invalid IP format: %s", ipdstr.String())
}
return tree.NewDBytes(tree.DBytes(ip)), nil
},
Info: "Converts the character string representation of an IP to its byte string " +
"representation.",
Volatility: tree.VolatilityImmutable,
},
),
"split_part": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{
{"input", types.String},
{"delimiter", types.String},
{"return_index_pos", types.Int},
},
ReturnType: tree.FixedReturnType(types.String),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
text := string(tree.MustBeDString(args[0]))
sep := string(tree.MustBeDString(args[1]))
field := int(tree.MustBeDInt(args[2]))
if field <= 0 {
return nil, pgerror.Newf(
pgcode.InvalidParameterValue, "field position %d must be greater than zero", field)
}
splits := strings.Split(text, sep)
if field > len(splits) {
return tree.NewDString(""), nil
}
return tree.NewDString(splits[field-1]), nil
},
Info: "Splits `input` on `delimiter` and return the value in the `return_index_pos` " +
"position (starting at 1). \n\nFor example, `split_part('123.456.789.0','.',3)`" +
"returns `789`.",
Volatility: tree.VolatilityImmutable,
},
),
"repeat": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{{"input", types.String}, {"repeat_counter", types.Int}},
ReturnType: tree.FixedReturnType(types.String),
Fn: func(evalCtx *tree.EvalContext, args tree.Datums) (_ tree.Datum, err error) {
s := string(tree.MustBeDString(args[0]))
count := int(tree.MustBeDInt(args[1]))
ln := len(s) * count
// Use <= here instead of < to prevent a possible divide-by-zero in the next
// if block.
if count <= 0 {
count = 0
} else if ln/count != len(s) {
// Detect overflow and trigger an error.
return nil, errStringTooLarge
} else if ln > maxAllocatedStringSize {
return nil, errStringTooLarge
}
return tree.NewDString(strings.Repeat(s, count)), nil
},
Info: "Concatenates `input` `repeat_counter` number of times.\n\nFor example, " +
"`repeat('dog', 2)` returns `dogdog`.",
Volatility: tree.VolatilityImmutable,
},
),
// https://www.postgresql.org/docs/10/static/functions-binarystring.html
"encode": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{{"data", types.Bytes}, {"format", types.String}},
ReturnType: tree.FixedReturnType(types.String),
Fn: func(evalCtx *tree.EvalContext, args tree.Datums) (_ tree.Datum, err error) {
data, format := *args[0].(*tree.DBytes), string(tree.MustBeDString(args[1]))
be, ok := sessiondatapb.BytesEncodeFormatFromString(format)
if !ok {
return nil, pgerror.New(pgcode.InvalidParameterValue,
"only 'hex', 'escape', and 'base64' formats are supported for encode()")
}
return tree.NewDString(lex.EncodeByteArrayToRawBytes(
string(data), be, true /* skipHexPrefix */)), nil
},
Info: "Encodes `data` using `format` (`hex` / `escape` / `base64`).",
Volatility: tree.VolatilityImmutable,
},
),
"decode": makeBuiltin(defProps(),
tree.Overload{
Types: tree.ArgTypes{{"text", types.String}, {"format", types.String}},
ReturnType: tree.FixedReturnType(types.Bytes),
Fn: func(evalCtx *tree.EvalContext, args tree.Datums) (_ tree.Datum, err error) {
data, format := string(tree.MustBeDString(args[0])), string(tree.MustBeDString(args[1]))
be, ok := sessiondatapb.BytesEncodeFormatFromString(format)
if !ok {
return nil, pgerror.New(pgcode.InvalidParameterValue,
"only 'hex', 'escape', and 'base64' formats are supported for decode()")
}
res, err := lex.DecodeRawBytesToByteArray(data, be)
if err != nil {
return nil, err
}
return tree.NewDBytes(tree.DBytes(res)), nil
},
Info: "Decodes `data` using `format` (`hex` / `escape` / `base64`).",
Volatility: tree.VolatilityImmutable,
},
),
"ascii": makeBuiltin(tree.FunctionProperties{Category: categoryString},
stringOverload1(
func(_ *tree.EvalContext, s string) (tree.Datum, error) {
for _, ch := range s {
return tree.NewDInt(tree.DInt(ch)), nil
}
return nil, errEmptyInputString
},
types.Int,
"Returns the character code of the first character in `val`. Despite the name, the function supports Unicode too.",
tree.VolatilityImmutable,
)),
"chr": makeBuiltin(tree.FunctionProperties{Category: categoryString},
tree.Overload{
Types: tree.ArgTypes{{"val", types.Int}},
ReturnType: tree.FixedReturnType(types.String),
Fn: func(_ *tree.EvalContext, args tree.Datums) (tree.Datum, error) {
x := tree.MustBeDInt(args[0])
var answer string
switch {
case x < 0:
return nil, errChrValueTooSmall
case x > utf8.MaxRune:
return nil, errChrValueTooLarge
default:
answer = string(rune(x))
}
return tree.NewDString(answer), nil
},