melihsozdinler commented on code in PR #40474:
URL: https://github.com/apache/spark/pull/40474#discussion_r1285903634
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlParser.scala:
##########
@@ -567,6 +568,135 @@ class SparkSqlAstBuilder extends AstBuilder {
}
}
+ /**
+ * Create a [[CreateVariableCommand]].
+ *
+ * For example:
+ * {{{
+ * DECLARE [OR REPLACE] [VARIABLE] [db_name.]variable_name
+ * [dataType] [defaultExpression];
+ * }}}
+ *
+ * We will ad CREATE VARIABLE for persisted variable definitions to this,
hence the name...
+ */
+ override def visitCreateVariable(ctx: CreateVariableContext): LogicalPlan =
withOrigin(ctx) {
+
+ def format(name: String): String = {
+ if (conf.caseSensitiveAnalysis) name else name.toLowerCase(Locale.ROOT)
+ }
+
+ val multipartIdentifier = visitMultipartIdentifier(ctx.multipartIdentifier)
+ val defaultExpression = if (ctx.variableDefaultExpression() == null) {
+ "null"
+ } else {
+ visitVariableDefaultExpression(ctx.variableDefaultExpression())
+ }
+ val dataTypeStr: Option[String] =
+ if (Option(ctx.dataType).nonEmpty) {
+ Option(source(Option(ctx.dataType).get))
+ } else {
+ Option(null)
+ }
+
+ if (multipartIdentifier.length > 3) {
+ throw QueryParsingErrors.unsupportedVariableNameError(
+ multipartIdentifier, ctx.multipartIdentifier)
+ }
+
+ val schemaQualifiedName = if (multipartIdentifier.length < 2) {
+ SESSION_DATABASE +: multipartIdentifier
+ } else {
+ multipartIdentifier
+ }
+
+ val catalogQualifiedName = if (schemaQualifiedName.length < 3) {
+ SYSTEM_CATALOG +: schemaQualifiedName
+ } else {
+ schemaQualifiedName
+ }
+ val variableIdentifier = VariableIdentifier(catalogQualifiedName)
+
+ if (variableIdentifier != VariableIdentifier(
+ Seq(SYSTEM_CATALOG, SESSION_DATABASE,
format(catalogQualifiedName.last)))) {
+ throw QueryParsingErrors.unsupportedVariableNameError(
+ multipartIdentifier, ctx.multipartIdentifier)
+ }
+
+ CreateVariableCommand(variableIdentifier, dataTypeStr, defaultExpression,
ctx.REPLACE != null)
+ }
+
+ /**
+ * Create a DROP VARIABLE statement.
+ *
+ * For example:
+ * {{{
+ * DROP TEMPORARY VARIABLE [IF EXISTS] variable;
+ * }}}
+ */
+ override def visitDropVariable(ctx: DropVariableContext): LogicalPlan =
withOrigin(ctx) {
+ val variableName = visitMultipartIdentifier(ctx.multipartIdentifier)
+ if (variableName.length > 3) {
+ throw QueryParsingErrors.unsupportedVariableNameError(variableName, ctx)
+ }
+
+ val variableIdentifier = VariableIdentifier(variableName)
+
+ if (ctx.TEMPORARY() != null) {
+ if (variableIdentifier.database.getOrElse(SESSION_DATABASE) !=
SESSION_DATABASE ||
+ variableIdentifier.catalog.getOrElse(SYSTEM_CATALOG) !=
SYSTEM_CATALOG) {
+ throw
QueryParsingErrors.unsupportedVariableNameError(variableIdentifier.nameParts,
ctx)
+ }
+
+ DropVariableCommand(
+ identifier = VariableIdentifier(Seq(SYSTEM_CATALOG, SESSION_DATABASE,
+ variableIdentifier.variableName)),
+ ifExists = ctx.EXISTS != null)
+ } else {
+ DropVariableCommand(
+ identifier = variableIdentifier,
+ ifExists = ctx.EXISTS != null)
+ }
+ }
+
+ override def visitSetVariable(ctx: SetVariableContext): LogicalPlan =
withOrigin(ctx) {
+
+ if (ctx.query() != null) {
+ /**
Review Comment:
We may use the correct one-liner comment based on this information here:
https://github.com/databricks/scala-style-guide#documentation-style
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