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feat: support DATETIME as an alias of TIMESTAMP - #26975

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hozan23 wants to merge 1 commit into
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hozan23:sql-datetime-timestamp-alias
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feat: support DATETIME as an alias of TIMESTAMP#26975
hozan23 wants to merge 1 commit into
apache:mainfrom
hozan23:sql-datetime-timestamp-alias

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@hozan23

@hozan23 hozan23 commented Oct 31, 2026

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Which issue does this PR close?

Rationale for this change

Planning DATETIME failed with "Unsupported SQL type" unless a TypePlanner handled it.

What changes are included in this PR?

DATETIME and DATETIME(p) are planned as TIMESTAMP without a time zone, with the same precisions and nanosecond default.

What is the testing strategy for this PR?

New sqllogictest cases in datetime/timestamps.slt. test_custom_type_plan now expects DATETIME to plan by default.

Are there any user-facing changes?

Yes, DATETIME is now supported without a TypePlanner. No API changes.

@hozan23
feat: support DATETIME as an alias of TIMESTAMP
1fa1d5d 
Planning DATETIME failed with "Unsupported SQL type" unless a
TypePlanner handled it.

Plan DATETIME and DATETIME(p) as TIMESTAMP without a time zone, with
the same precisions and nanosecond default.
@github-actions github-actions Bot added documentation Improvements or additions to documentation sql SQL Planner sqllogictest SQL Logic Tests (.slt) labels Oct 31, 2026
@hozan23 hozan23 mentioned this pull request Oct 31, 2026
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alamb
alamb approved these changes Nov 1, 2026
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@alamb alamb left a comment

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Thanks -- makes sense to me

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@alamb alamb alamb approved these changes

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documentation Improvements or additions to documentation sql SQL Planner sqllogictest SQL Logic Tests (.slt)

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Support DATETIME SQL type in the planner

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@hozan23 @alamb