lsyldliu commented on code in PR #19419:
URL: https://github.com/apache/flink/pull/19419#discussion_r858254419
##########
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/utils/OperationConverterUtils.java:
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@@ -117,6 +128,193 @@ public static Operation convertAddReplaceColumns(
catalogTable.getComment()));
}
+ public static Operation convertAlterTableDropConstraint(
+ ObjectIdentifier tableIdentifier,
+ CatalogTable catalogTable,
+ SqlAlterTableDropConstraint alterTableDropConstraint) {
+ boolean isPrimaryKey = alterTableDropConstraint.isPrimaryKey();
+ Optional<Schema.UnresolvedPrimaryKey> oriPrimaryKey =
+ catalogTable.getUnresolvedSchema().getPrimaryKey();
+ // validate primary key is exists in table
+ if (!oriPrimaryKey.isPresent()) {
+ throw new ValidationException(
+ String.format("Table %s does not exist primary key.",
tableIdentifier));
+ }
+
+ String constraintName = null;
+ if (alterTableDropConstraint.getConstraintName().isPresent()) {
+ constraintName =
alterTableDropConstraint.getConstraintName().get().getSimple();
+ }
+ if (!StringUtils.isNullOrWhitespaceOnly(constraintName)
+ &&
!oriPrimaryKey.get().getConstraintName().equals(constraintName)) {
Review Comment:
Yes, flink only support primary key constraint, doesn't support unique
constraint.
https://github.com/apache/flink/blob/master/flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/operations/SqlToOperationConverter.java#L1212
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