sql: refactor unimplemented statements into one file pkg/sql/unimplem…

…ented.go

Moved files with unimplemented stubs into just 1 file unimplemented.go.
These unimplemented stubs work in DSC only and we will not implement
them on the legacy schema changer.

Fixes: #45671
Release note: none

pkg/sql/BUILD.bazel

@@ -13,7 +13,6 @@ go_library(
         "alter_function.go",
         "alter_index.go",
         "alter_index_visible.go",
-        "alter_policy.go",
         "alter_primary_key.go",
         "alter_role.go",
         "alter_schema.go",
@@ -41,7 +40,6 @@ go_library(
         "comment_on_index.go",
         "comment_on_schema.go",
         "comment_on_table.go",
-        "comment_on_type.go",
         "compact_sql_stats.go",
         "completions.go",
         "conn_executor.go",
@@ -64,7 +62,6 @@ go_library(
         "create_external_connection.go",
         "create_function.go",
         "create_index.go",
-        "create_policy.go",
         "create_role.go",
         "create_schema.go",
         "create_sequence.go",
@@ -103,13 +100,11 @@ go_library(
         "drop_function.go",
         "drop_index.go",
         "drop_owned_by.go",
-        "drop_policy.go",
         "drop_role.go",
         "drop_schema.go",
         "drop_sequence.go",
         "drop_table.go",
         "drop_tenant.go",
-        "drop_trigger.go",
         "drop_type.go",
         "drop_view.go",
         "error_hints.go",
@@ -279,6 +274,7 @@ go_library(
         "txn_state.go",
         "type_change.go",
         "unary.go",
+        "unimplemented.go",
         "union.go",
         "unlisten.go",
         "unsplit.go",

pkg/sql/unimplemented.go

@@ -0,0 +1,55 @@
+// Copyright 2024 The Cockroach Authors.
+//
+// Use of this software is governed by the CockroachDB Software License
+// included in the /LICENSE file.
+
+package sql
+
+import (
+	"context"
+
+	"github.com/cockroachdb/cockroach/pkg/sql/pgwire/pgcode"
+	"github.com/cockroachdb/cockroach/pkg/sql/pgwire/pgerror"
+	"github.com/cockroachdb/cockroach/pkg/sql/sem/tree"
+)
+
+// The below methods are ordered in alphabetical order. They represent statements
+// which are UNIMPLEMENTED for the legacy schema changer.
+
+func (p *planner) AlterPolicy(ctx context.Context, n *tree.AlterPolicy) (planNode, error) {
+	return nil, pgerror.New(pgcode.FeatureNotSupported,
+		"ALTER POLICY is only implemented in the declarative schema changer")
+}
+
+func (p *planner) CommentOnType(ctx context.Context, n *tree.CommentOnType) (planNode, error) {
+	return nil, pgerror.New(pgcode.FeatureNotSupported,
+		"COMMENT ON TYPE is only implemented in the declarative schema changer")
+}
+
+func (p *planner) CreatePolicy(ctx context.Context, n *tree.CreatePolicy) (planNode, error) {
+	return nil, pgerror.New(pgcode.FeatureNotSupported,
+		"CREATE POLICY is only implemented in the declarative schema changer")
+}
+
+func (p *planner) DropOwnedBy(ctx context.Context) (planNode, error) {
+	if err := checkSchemaChangeEnabled(
+		ctx,
+		p.ExecCfg(),
+		"DROP OWNED BY",
+	); err != nil {
+		return nil, err
+	}
+
+	return nil, pgerror.New(pgcode.FeatureNotSupported,
+		"DROP OWNED BY is only implemented in the declarative schema changer")
+}
+
+func (p *planner) DropPolicy(ctx context.Context, n *tree.DropPolicy) (planNode, error) {
+	return nil, pgerror.New(pgcode.FeatureNotSupported,
+		"DROP POLICY is only implemented in the declarative schema changer")
+}
+
+func (p *planner) DropTrigger(_ context.Context, _ *tree.DropTrigger) (planNode, error) {
+	return nil, pgerror.New(pgcode.FeatureNotSupported,
+		"DROP TRIGGER is only implemented in the declarative schema changer")
+}