pingcap / pingcap/ticdc

Optimize digest calculation for columnSchema with default value and original default value

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severity/moderate type/enhancement
Dominant language
Go
Stars
56
Forks
63
Avg merge
2d 20h
Merged PRs (30d)
34

Description

consider GetDefaultValue() and GetOriginDefaultValue() in hashTableInfo

if !reflect.DeepEqual(col.GetDefaultValue(), columns[i].GetDefaultValue()) {
	return false
}

if !reflect.DeepEqual(col.GetOriginDefaultValue(), columns[i].GetOriginDefaultValue()) {
	return false
}

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First steps

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Research direction

Locate hashTableInfo and its digest comparison logic, then inspect how column defaults are currently compared. Ensure both GetDefaultValue() and GetOriginDefaultValue() are considered, and verify that digest comparisons distinguish columns when either value differs.

Written by the indexing model from the issue text.

Assessment

Tech stack
go
Domain
database
Issue type
Refactor
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
45/100

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