Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/10660#discussion_r49164582
--- Diff:
sql/catalyst/src/main/antlr3/org/apache/spark/sql/catalyst/parser/FromClauseParser.g
---
@@ -151,8 +151,8 @@ fromSource
@after { gParent.popMsg(state); }
:
(LPAREN KW_VALUES) => fromSource0
- | (LPAREN) => LPAREN joinSource RPAREN -> joinSource
| fromSource0
+ | (LPAREN joinSource) => LPAREN joinSource RPAREN -> joinSource
--- End diff --
How does the order matter? Don't really understand ANTLR3, thanks!
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