[jira] [Updated] (SPARK-22553) Drop FROM in nonReserved

["Suchith J N (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-22553?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Suchith J N updated SPARK-22553:
--------------------------------
    Attachment: Removed_FROM_from_nonReserved_list.patch

Removed FROM from nonReserved

> Drop FROM in nonReserved
> ------------------------
>
>                 Key: SPARK-22553
>                 URL: https://issues.apache.org/jira/browse/SPARK-22553
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Takeshi Yamamuro
>            Priority: Trivial
>         Attachments: Removed_FROM_from_nonReserved_list.patch
>
>
> A simple query below throws a misleading error because nonReserved has `SELECT` in SqlBase.q4:
> {code}
> scala> Seq((1, 2)).toDF("a", "b").createTempView("t")
> scala> sql("select a, count(1), from t group by 1").show
> org.apache.spark.sql.AnalysisException: cannot resolve '`a`' given input columns: []; line 1 pos 7;
> 'Aggregate [unresolvedordinal(1)], ['a, count(1) AS count(1)#13L, 'from AS t#11]
> +- OneRowRelation$
>   at org.apache.spark.sql.catalyst.analysis.package$AnalysisErrorAt.failAnalysis(package.scala:42)
>   at org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1$$anonfun$apply$2.applyOrElse(CheckAnalysis.scala:88)
>   at org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$1$$anonfun$apply$2.applyOrElse(CheckAnalysis.scala:85)
>   at org.apache.spark.sql.catalyst.trees.TreeNode$$anonfun$transformUp$1.apply(TreeNode.scala:289)
> {code}
> I know nonReserved currently has `SELECT` because of the historical reason (https://github.com/apache/spark/pull/18079#discussion_r118842186). But, since IMHO this is a kind of common mistakes (This message annoyed me a few days ago in large SQL queries...), it might be worth dropping it in the reserved.
> FYI: In postgresql throws an explicit error in this case:
> {code}
> postgres=# select a, count(1), from test group by b;
> ERROR:  syntax error at or near "from" at character 21
> STATEMENT:  select a, count(1), from test group by b;
> ERROR:  syntax error at or near "from"
> LINE 1: select a, count(1), from test group by b;
> {code}



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