[Spark] ALTER TABLE ALTER COLUMN SYNC IDENTITY SQL support #3005
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Which Delta project/connector is this regarding?
Description
This PR is part of #1959
In this PR, we add SQL support for
ALTER TABLE ALTER COLUMN SYNC IDENTITY
.This is used for GENERATED BY DEFAULT Identity Columns, where a user may want to manually update the identity column high watermark.
How was this patch tested?
This PR adds a new test suite
IdentityColumnSyncSuite
.Does this PR introduce any user-facing changes?
Yes. We introduce the SQL syntax
ALTER TABLE (ALTER| CHANGE) COLUMN? <colName> SYNC IDENTITY
into Delta. This will update the high watermark stored in the metadata for that specific identity column.Example Usage