Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/12646#discussion_r120000387
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
---
@@ -1105,19 +1105,26 @@ class AstBuilder(conf: SQLConf) extends
SqlBaseBaseVisitor[AnyRef] with Logging
}
/**
- * Create a name LTRIM for TRIM(Leading), RTRIM for TRIM(Trailing), TRIM
for TRIM(BOTH)
+ * Create a function name LTRIM for TRIM(Leading), RTRIM for
TRIM(Trailing), TRIM for TRIM(BOTH),
+ * otherwise, returnthe original funcID.
--- End diff --
nit: `return the original function identifier.`
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