Github user sarutak commented on a diff in the pull request:
https://github.com/apache/spark/pull/3433#discussion_r21136072
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/SqlParser.scala ---
@@ -362,7 +362,7 @@ class SqlParser extends AbstractSparkSQLParser {
protected lazy val baseExpression: Parser[Expression] =
( "*" ^^^ Star(None)
- | primary
+ | primary * ("||" ^^^ {(e1: Expression, e2: Expression) => Concat(e1,
e2) })
--- End diff --
Actually, I found the precedence of the operator is different depends on
the implementation of RDBMS. The precedence of this operator in this PR is
similar to PostgreSQL's implementation.
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