Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/14034#discussion_r69599041 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala --- @@ -46,6 +46,20 @@ trait CheckAnalysis extends PredicateHelper { }).length > 1 } + private def checkLimitClause(limitExpr: Expression): Unit = { + if (!limitExpr.foldable) { --- End diff -- Are you saying we should change the SQL parser? You know, if so, we also need to change the `TABLESAMPLE n ROWS`. FYI, even Hive does not support foldable expressions. ``` hive> select * from t1 limit 1 + 1; FAILED: ParseException line 1:25 missing EOF at '+' near '1' hive> select * from t1 limit (1+1); FAILED: ParseException line 1:23 extraneous input '(' expecting Number near '1' ``` I found that Impala supports it. http://www.cloudera.com/documentation/archive/impala/2-x/2-1-x/topics/impala_limit.html
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