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https://issues.apache.org/jira/browse/SPARK-22553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16258283#comment-16258283
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Takeshi Yamamuro commented on SPARK-22553:
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cc: [~hvanhovell] [~smilegator]
> 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
>
> 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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