davidm-db commented on code in PR #46665:
URL: https://github.com/apache/spark/pull/46665#discussion_r1636117355


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala:
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@@ -117,6 +118,57 @@ class AstBuilder extends DataTypeAstBuilder with 
SQLConfHelper with Logging {
     }
   }
 
+  override def visitCompoundOrSingleStatement(
+      ctx: CompoundOrSingleStatementContext): CompoundBody = {
+    Option(ctx.singleCompoundStatement()).map { s =>
+      visit(s).asInstanceOf[CompoundBody]
+    }.getOrElse {
+      val logicalPlan = visitSingleStatement(ctx.singleStatement())
+      CompoundBody(Seq(SingleStatement(
+        parsedPlan = logicalPlan,
+        sourceStart = ctx.start.getStartIndex,
+        sourceEnd = ctx.stop.getStopIndex + 1)))
+    }
+  }
+
+  override def visitSingleCompoundStatement(ctx: 
SingleCompoundStatementContext): CompoundBody = {
+    visit(ctx.beginEndCompoundBlock()).asInstanceOf[CompoundBody]
+  }
+
+  private def visitCompoundBodyImpl(ctx: CompoundBodyContext): CompoundBody = {
+    val buff = ListBuffer[CompoundPlanStatement]()
+    for (i <- 0 until ctx.getChildCount) {
+      val child = ctx.getChild(i)
+      val visitedChild = visit(ctx.getChild(i))
+      visitedChild match {
+        case statement: CompoundPlanStatement => buff += statement
+        case null if child.isInstanceOf[TerminalNodeImpl] =>
+      }
+    }
+
+    CompoundBody(buff.toSeq)
+  }
+
+  override def visitBeginEndCompoundBlock(ctx: BeginEndCompoundBlockContext): 
CompoundBody = {
+    visitCompoundBodyImpl(ctx.compoundBody())
+  }
+
+  override def visitCompoundBody(ctx: CompoundBodyContext): CompoundBody = {
+    visitCompoundBodyImpl(ctx)
+  }
+
+  override def visitCompoundStatement(ctx: CompoundStatementContext): 
CompoundPlanStatement = {
+    val child = visit(ctx.getChild(0))

Review Comment:
   Do you mean like checking if we are visiting `statement` or 
`beginEndCompoundBlock` first and then do the visit, instead of visiting first 
and than matching on the output type?
   I will change it to this anyways because I think it makes more sense and it 
cleaner than `getChild(0)` etc...



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