davidm-db commented on code in PR #49726:
URL: https://github.com/apache/spark/pull/49726#discussion_r1946339387


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala:
##########
@@ -288,6 +288,42 @@ class AstBuilder extends DataTypeAstBuilder
     ExceptionHandler(exceptionHandlerTriggers, body, handlerType)
   }
 
+  override def visitSignalStatementWithCondition(
+      ctx: SignalStatementWithConditionContext): SignalStatement = {
+    val messageString = Option(ctx.msgStr)
+      .map(sl => Left(string(visitStringLit(sl)).replace("'", "")))
+    val messageVariable = Option(ctx.msgVar)
+      .map(mpi => Right(UnresolvedAttribute(visitMultipartIdentifier(mpi))))
+    val messageArguments = Option(ctx.argVar)
+      .map(mpi => UnresolvedAttribute(visitMultipartIdentifier(mpi)))
+
+    SignalStatement(
+      errorCondition = 
Some(ctx.conditionName.getText.toUpperCase(Locale.ROOT)),
+      sqlState = None,

Review Comment:
   Let's add a comment that explains that we set the `sqlState` to `None` here 
and fill it in in `visitCompoundBodyImpl` once all the conditions have been 
resolved.



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