dtenedor commented on a change in pull request #35982:
URL: https://github.com/apache/spark/pull/35982#discussion_r836702055
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/ResolveDefaultColumns.scala
##########
@@ -18,14 +18,227 @@
package org.apache.spark.sql.catalyst.util
import org.apache.spark.sql.AnalysisException
-import org.apache.spark.sql.catalyst.analysis.Analyzer
+import org.apache.spark.sql.catalyst.TableIdentifier
+import org.apache.spark.sql.catalyst.analysis.{Analyzer, NoSuchTableException,
UnresolvedAttribute, UnresolvedInlineTable, UnresolvedRelation}
+import org.apache.spark.sql.catalyst.catalog.{SessionCatalog,
UnresolvedCatalogRelation}
import org.apache.spark.sql.catalyst.expressions._
import org.apache.spark.sql.catalyst.optimizer.ConstantFolding
import org.apache.spark.sql.catalyst.parser.{CatalystSqlParser, ParseException}
import org.apache.spark.sql.catalyst.plans.logical._
+import org.apache.spark.sql.catalyst.rules.Rule
+import org.apache.spark.sql.catalyst.util.ResolveDefaultColumns._
import org.apache.spark.sql.internal.SQLConf
import org.apache.spark.sql.types._
+/**
+ * This is a rule to process DEFAULT columns in statements such as
CREATE/REPLACE TABLE.
+ *
+ * Background: CREATE TABLE and ALTER TABLE invocations support setting column
default values for
+ * later operations. Following INSERT, and INSERT MERGE commands may then
reference the value
+ * using the DEFAULT keyword as needed.
+ *
+ * Example:
+ * CREATE TABLE T(a INT DEFAULT 4, b INT NOT NULL DEFAULT 5);
+ * INSERT INTO T VALUES (1, 2);
+ * INSERT INTO T VALUES (1, DEFAULT);
+ * INSERT INTO T VALUES (DEFAULT, 6);
+ * SELECT * FROM T;
+ * (1, 2)
+ * (1, 5)
+ * (4, 6)
+ *
+ * @param analyzer analyzer to use for processing DEFAULT values stored as
text.
+ * @param catalog the catalog to use for looking up the schema of INSERT INTO
table objects.
+ * @param insert the enclosing INSERT statement for which this rule is
processing the query, if any.
+ */
+case class ResolveDefaultColumns(
+ analyzer: Analyzer,
Review comment:
Done.
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