Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/15423#discussion_r82744230
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlParser.scala ---
@@ -168,17 +168,7 @@ class SparkSqlAstBuilder(conf: SQLConf) extends
AstBuilder {
* }}}
*/
override def visitShowColumns(ctx: ShowColumnsContext): LogicalPlan =
withOrigin(ctx) {
- val table = visitTableIdentifier(ctx.tableIdentifier)
-
- val lookupTable = Option(ctx.db) match {
- case None => table
- case Some(db) if table.database.exists(_ != db) =>
- operationNotAllowed(
- s"SHOW COLUMNS with conflicting databases: '$db' !=
'${table.database.get}'",
- ctx)
- case Some(db) => TableIdentifier(table.identifier, Some(db.getText))
- }
- ShowColumnsCommand(lookupTable)
+ ShowColumnsCommand(Option(ctx.db).map(_.getText),
visitTableIdentifier(ctx.tableIdentifier))
--- End diff --
FYI, MySQL will treat `SHOW COLUMNS FROM db1.tbl1 FROM db2` as `SHOW
COLUMNS FROM tbl1 FROM db2`, i.e. if `FROM database` is specified, it will just
ignore the database specified in table name, instead of reporting error.
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