Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/18023#discussion_r117326828 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala --- @@ -1229,25 +1228,56 @@ class AstBuilder(conf: SQLConf) extends SqlBaseBaseVisitor[AnyRef] with Logging CaseWhen(branches, Option(ctx.elseExpression).map(expression)) } + def enableHiveSupportQuotedIdentifiers() : Boolean = { + SparkEnv.get != null && + SparkEnv.get.conf != null && + SparkEnv.get.conf.getBoolean("hive.support.quoted.identifiers", false) + } + /** - * 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) => + case unresolved_attr @ UnresolvedAttribute(nameParts) => + if (enableHiveSupportQuotedIdentifiers) { + val escapedIdentifier = "`(.+)`".r + val ret = Option(ctx.fieldName.getStart).map(_.getText match { + case r@escapedIdentifier(i) => + UnresolvedRegex(i, Some(unresolved_attr.name)) --- End diff -- How about no change in the parser? Is that possible we can simply resolve it in `ResolveReferences`? BTW, we also need to handle the same issue in the Dataset APIs.
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