[SPARK-30814][SQL][3.0] ALTER TABLE ... ADD COLUMN position should be able to reference columns being added#27624
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imback82 wants to merge 1 commit intoapache:branch-3.0from
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[SPARK-30814][SQL][3.0] ALTER TABLE ... ADD COLUMN position should be able to reference columns being added#27624imback82 wants to merge 1 commit intoapache:branch-3.0from
imback82 wants to merge 1 commit intoapache:branch-3.0from
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cc @cloud-fan |
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Test build #118649 has finished for PR 27624 at commit
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thanks, merging to 3.0! |
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Feb 19, 2020
… able to reference columns being added (Backport of #27584 + partial #27482) ### What changes were proposed in this pull request? In ALTER TABLE, a column in ADD COLUMNS can depend on the position of a column that is just being added. For example, for a table with the following schema: ``` root: - a: string - b: long ``` , the following should work: ``` ALTER TABLE t ADD COLUMNS (x int AFTER a, y int AFTER x) ``` Currently, the above statement will throw an exception saying that AFTER x cannot be resolved, because x doesn't exist yet. This PR proposes to fix this issue. ### Why are the changes needed? To fix a bug described above. ### Does this PR introduce any user-facing change? Yes, now ``` ALTER TABLE t ADD COLUMNS (x int AFTER a, y int AFTER x) ``` works as expected. ### How was this patch tested? Added new tests Closes #27624 from imback82/backport_27584. Authored-by: Terry Kim <yuminkim@gmail.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com>
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(Backport of #27584 + partial #27482)
What changes were proposed in this pull request?
In ALTER TABLE, a column in ADD COLUMNS can depend on the position of a column that is just being added. For example, for a table with the following schema:
, the following should work:
Currently, the above statement will throw an exception saying that AFTER x cannot be resolved, because x doesn't exist yet. This PR proposes to fix this issue.
Why are the changes needed?
To fix a bug described above.
Does this PR introduce any user-facing change?
Yes, now
works as expected.
How was this patch tested?
Added new tests