codec: fix the open protocol flag

[3AceShowHand]

What problem does this PR solve?

Issue Number: close #1227

What is changed and how it works?

• Changing the column Flag type from uint to uint64 and updating related flag-check calls to use new helper functions (e.g. isBinary, isUnsigned, isPrimary).
• Introducing a column flags caching mechanism in the batch encoder to improve flag calculation efficiency.
• Adjusting encoding and decoding logic to properly pass the computed column flags.

Check List

Tests

• Unit test
• Integration test

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

`None`

[3AceShowHand]

/retest

[Copilot]

Pull Request Overview

This PR fixes issues in the open protocol flag handling for TiCDC by updating underlying flag types and helper functions. Key changes include:

• Changing the column Flag type from uint to uint64 and updating related flag-check calls to use new helper functions (e.g. isBinary, isUnsigned, isPrimary).
• Introducing a column flags caching mechanism in the batch encoder to improve flag calculation efficiency.
• Adjusting encoding and decoding logic to properly pass the computed column flags.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pkg/sink/codec/open/message.go	Updates flag type and flag checks using helper functions
pkg/sink/codec/open/encoder_test.go	Adds/updates tests to verify proper event encoding
pkg/sink/codec/open/encoder.go	Introduces columnFlagsCache and updates encoding to use cached flags
pkg/sink/codec/open/decoder.go	Replaces direct mysql flag checks with helper function calls
pkg/sink/codec/open/codec.go	Updates row event encoding to include column flags

Comments suppressed due to low confidence (1)

pkg/sink/codec/open/decoder.go:254

• Flagging handle key columns with 'binaryFlag' appears incorrect; it should use the proper primary key flag to accurately represent a column's handle key role.

col.Flag |= binaryFlag

[wk989898]

Why use a binary flag?

[3AceShowHand]

it's found a binary flag.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: wk989898

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• OWNERS [wk989898]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-04-16 05:53:45.430815098 +0000 UTC m=+2840519.115051179: ☑️ agreed by wk989898.

[3AceShowHand]

/unhold

[3AceShowHand]

/retest

[ti-chi-bot]

@3AceShowHand: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cdc-pulsar-integration-light	64e9580	link	false	/test pull-cdc-pulsar-integration-light
pull-cdc-kafka-integration-light	64e9580	link	false	/test pull-cdc-kafka-integration-light

Full PR test history. Your PR dashboard.

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