Github user janewangfb commented on a diff in the pull request:
https://github.com/apache/spark/pull/18023#discussion_r119194989
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
---
@@ -1230,25 +1230,37 @@ class AstBuilder(conf: SQLConf) extends
SqlBaseBaseVisitor[AnyRef] with Logging
}
/**
- * Create a dereference expression. The return type depends on the type
of the parent, this can
- * either be a [[UnresolvedAttribute]] (if the parent is an
[[UnresolvedAttribute]]), or an
- * [[UnresolvedExtractValue]] if the parent is some expression.
+ * Create a dereference expression. The return type depends on the type
of the parent.
+ * If the parent is an [[UnresolvedAttribute]], it can be a
[[UnresolvedAttribute]] or
+ * a [[UnresolvedRegex]] for regex quoted in ``; if the parent is some
other expression,
+ * it can be [[UnresolvedExtractValue]].
*/
override def visitDereference(ctx: DereferenceContext): Expression =
withOrigin(ctx) {
val attr = ctx.fieldName.getText
expression(ctx.base) match {
- case UnresolvedAttribute(nameParts) =>
- UnresolvedAttribute(nameParts :+ attr)
+ case unresolved_attr @ UnresolvedAttribute(nameParts) =>
+ ctx.fieldName.getStart.getText match {
+ case escapedIdentifier(columnNameRegex) if
conf.supportQuotedRegexColumnName =>
+ UnresolvedRegex(columnNameRegex, Some(unresolved_attr.name))
+ case _ =>
+ UnresolvedAttribute(nameParts :+ attr)
+ }
case e =>
UnresolvedExtractValue(e, Literal(attr))
}
}
/**
- * Create an [[UnresolvedAttribute]] expression.
+ * Create an [[UnresolvedAttribute]] expression or a [[UnresolvedRegex]]
if it is a regex
--- End diff --
@cloud-fan, the code path is shared by by both select a, select a.b and
where cause. If it is select a.b, the table part also go here and it will not
be right. I rolled back to the code before last friday (June 23rd, 2017).
Do you have any suggestion? Currently Hive only supports select column
regex expansion. and this PR matches the hive behavior.s
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