Storage: refine some code in lm

[Lloyd-Pottiger]

What problem does this PR solve?

Issue Number: ref #5829

Problem Summary:

What is changed and how it works?

1. remove useless dag_sets in DAGQueryInfo
2. source_columns is also useless, change it to type ColumnInfos
3. use DAGQueryInfo.source_columns to build push down filter rather than table_info

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• hongyunyan
• ywqzzy

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[Lloyd-Pottiger]

/run-all-tests

[hongyunyan]

LGTM

[Lloyd-Pottiger]

/merge

[ti-chi-bot]

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 616fdea