fix: EXPOSED-19 Max timestamp in SQLite not working

In the `create` function in `ResultRow.kt`, `columnType` is null because `(field as? Column<*>)` is null. This causes the object read from the DB to be of type String instead of Timestamp, which results in failing to parse the date because it is not in the proper format for `Instant.parse`.

`field` is of type `org.jetbrains.exposed.sql.Max` when we run the test. This is the relationship between the classes (-> means "is a subclass of"):
Max -> Function -> ExpressionWithColumnType -> Expression
Column -> ExpressionWithColumnType -> Expression

We attempt to cast `Max` to `Column` and that fails because there is no relationship between them. So I created a marker interface `WithColumnType` for anything with a column type and cast to that instead.

exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/Column.kt

@@ -20,7 +20,7 @@ class Column<T>(
     val name: String,
     /** Data type of the column. */
     override val columnType: IColumnType
-) : ExpressionWithColumnType<T>(), DdlAware, Comparable<Column<*>> {
+) : ExpressionWithColumnType<T>(), DdlAware, Comparable<Column<*>>, WithColumnType {
     var foreignKey: ForeignKeyConstraint? = null
 
     /** Returns the column that this column references. */

exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/ColumnType.kt

@@ -914,3 +914,10 @@ class EnumerationNameColumnType<T : Enum<T>>(
 interface IDateColumnType {
     val hasTimePart: Boolean
 }
+
+/**
+ * Marker interface for columns/expressions with a column type
+ */
+interface WithColumnType {
+    val columnType: IColumnType
+}

exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/Function.kt

@@ -146,7 +146,11 @@ class Min<T : Comparable<T>, in S : T?>(
     /** Returns the expression from which the minimum value is obtained. */
     val expr: Expression<in S>,
     columnType: IColumnType
-) : Function<T?>(columnType) {
+) : Function<T?>(columnType), WithColumnType {
+
+    override val columnType: IColumnType
+        get() = super.columnType
+
     override fun toQueryBuilder(queryBuilder: QueryBuilder): Unit = queryBuilder { append("MIN(", expr, ")") }
 }
 
@@ -157,7 +161,10 @@ class Max<T : Comparable<T>, in S : T?>(
     /** Returns the expression from which the maximum value is obtained. */
     val expr: Expression<in S>,
     columnType: IColumnType
-) : Function<T?>(columnType) {
+) : Function<T?>(columnType), WithColumnType {
+    override val columnType: IColumnType
+        get() = super.columnType
+
     override fun toQueryBuilder(queryBuilder: QueryBuilder): Unit = queryBuilder { append("MAX(", expr, ")") }
 }
 

exposed-core/src/main/kotlin/org/jetbrains/exposed/sql/ResultRow.kt

@@ -98,7 +98,7 @@ class ResultRow(
         fun create(rs: ResultSet, fieldsIndex: Map<Expression<*>, Int>): ResultRow {
             return ResultRow(fieldsIndex).apply {
                 fieldsIndex.forEach { (field, index) ->
-                    val columnType = (field as? ExpressionWithColumnType<*>)?.columnType
+                    val columnType = (field as? WithColumnType)?.columnType
                     val value = if (columnType != null)
                         columnType.readObject(rs, index + 1)
                     else rs.getObject(index + 1)