Support multi-column aliases in SELECT items#2289
Merged
yoavcloud merged 2 commits intoapache:mainfrom Apr 9, 2026
Merged
Conversation
4 tasks
yoavcloud
reviewed
Apr 9, 2026
| ); | ||
| } | ||
|
|
||
| #[test] |
Contributor
There was a problem hiding this comment.
Can this test move to common?
yoavcloud
requested changes
Apr 9, 2026
Contributor
yoavcloud
left a comment
yoavcloud
left a comment
There was a problem hiding this comment.
Overall looks good, please see my comment inline and we're good to go!
Spark SQL grammar allows parenthesized identifier lists as SELECT
item aliases:
namedExpression: expression (AS? (identifier | identifierList))?
identifierList: '(' identifier (',' identifier)* ')'
This enables syntax like:
SELECT stack(2, 'a', 'b', 'c', 'd') AS (col1, col2)
funcpp
force-pushed
the
support-multi-column-alias
branch
from
156b6ff to
7708a40
Compare
yoavcloud
approved these changes
Apr 9, 2026
github-merge-queue
bot
removed this pull request from the merge queue due to a conflict with the base branch
Integrate supports_cte_without_as and other upstream changes into the support-multi-column-alias branch.
funcpp
force-pushed
the
support-multi-column-alias
branch
2 times, most recently
from
ff42726 to
325744f
Compare
Contributor
Author
|
@yoavcloud Rebased, Could you check it? |
LucaCappelletti94
pushed a commit
to LucaCappelletti94/sqlparser-rs
that referenced
this pull request
Apr 9, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary
Add support for parenthesized multi-column aliases in SELECT items, as defined in the Spark SQL grammar:
This enables syntax like:
Changes
SelectItem::ExprWithAliasesvariant for multi-column aliasesDialect::supports_select_item_multi_column_alias(), enabled for Databricks and Generic dialectsAS (ident, ident, ...)when the dialect supports itContext
While not documented in the Databricks SQL reference, this syntax is part of the Spark SQL grammar that Databricks implements. Verified to execute successfully on Databricks Runtime:
Test plan
SELECT stack(...) AS (col1, col2)with and without FROMcargo fmt,cargo clippy, full test suite pass