cloud-fan commented on code in PR #49006:
URL: https://github.com/apache/spark/pull/49006#discussion_r1884302095
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sql/core/src/main/scala/org/apache/spark/sql/scripting/SqlScriptingExecutionNode.scala:
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@@ -177,12 +180,54 @@ class NoOpStatementExec extends LeafStatementExec {
* Executable nodes for nested statements within the CompoundBody.
* @param label
* Label set by user to CompoundBody or None otherwise.
+ * @param isScope
+ * Flag that indicates whether Compound Body is scope or not.
+ * @param context
+ * SqlScriptingExecutionContext keeps the execution state of current script.
*/
-class CompoundBodyExec(statements: Seq[CompoundStatementExec], label:
Option[String] = None)
+class CompoundBodyExec(
+ statements: Seq[CompoundStatementExec],
+ label: Option[String] = None,
+ isScope: Boolean,
+ context: SqlScriptingExecutionContext)
extends NonLeafStatementExec {
+ private object ScopeStatus extends Enumeration {
+ type ScopeStatus = Value
+ val NOT_ENTERED, INSIDE, EXITED = Value
+ }
+
private var localIterator = statements.iterator
private var curr = if (localIterator.hasNext) Some(localIterator.next())
else None
+ private var scopeStatus = ScopeStatus.NOT_ENTERED
+
+ /**
+ * Enter scope represented by this compound statement.
+ *
+ * This operation needs to be idempotent because it is called multiple times
during
+ * iteration, but it should be executed only once when compound body that
represent
+ * scope is encountered for the first time.
+ */
+ def enterScope(): Unit = {
+ // This check makes this operation idempotent.
+ if (isScope && scopeStatus == ScopeStatus.NOT_ENTERED) {
+ scopeStatus = ScopeStatus.INSIDE
+ context.enterScope(label.get)
Review Comment:
only labeled statement has scope?
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