schemachanger: add support for discarding subzones

This patch adds support for discarding a subzone config in the
DSC.

Fixes: #133158
Epic: none

Release note: None

pkg/ccl/schemachangerccl/testdata/decomp/multiregion

@@ -1355,6 +1355,7 @@ ElementState:
   Status: PUBLIC
 - PartitionZoneConfig:
     indexId: 1
+    oldIdxRef: -1
     partitionName: us-east1
     seqNum: 0
     subzone:
@@ -1392,6 +1393,7 @@ ElementState:
   Status: PUBLIC
 - PartitionZoneConfig:
     indexId: 1
+    oldIdxRef: -1
     partitionName: us-east2
     seqNum: 0
     subzone:
@@ -1429,6 +1431,7 @@ ElementState:
   Status: PUBLIC
 - PartitionZoneConfig:
     indexId: 1
+    oldIdxRef: -1
     partitionName: us-east3
     seqNum: 0
     subzone:

pkg/ccl/schemachangerccl/testdata/end_to_end/alter_index_configure_zone/alter_index_configure_zone.explain

@@ -11,7 +11,7 @@ Schema change plan for ALTER INDEX ‹defaultdb›.‹public›.‹t›@‹foo
  │         ├── 1 element transitioning toward PUBLIC
  │         │    └── ABSENT → PUBLIC IndexZoneConfig:{DescID: 104 (t), IndexID: 2 (foo), SeqNum: 1}
  │         └── 1 Mutation operation
- │              └── AddIndexZoneConfig {"TableID":104}
+ │              └── AddIndexZoneConfig {"SubzoneIndexToDelete":-1,"TableID":104}
  └── PreCommitPhase
       ├── Stage 1 of 2 in PreCommitPhase
       │    ├── 1 element transitioning toward PUBLIC
@@ -22,4 +22,4 @@ Schema change plan for ALTER INDEX ‹defaultdb›.‹public›.‹t›@‹foo
            ├── 1 element transitioning toward PUBLIC
            │    └── ABSENT → PUBLIC IndexZoneConfig:{DescID: 104 (t), IndexID: 2 (foo), SeqNum: 1}
            └── 1 Mutation operation
-                └── AddIndexZoneConfig {"TableID":104}
+                └── AddIndexZoneConfig {"SubzoneIndexToDelete":-1,"TableID":104}

pkg/ccl/schemachangerccl/testdata/end_to_end/alter_index_configure_zone_multiple/alter_index_configure_zone_multiple__statement_1_of_3.explain

@@ -11,7 +11,7 @@ Schema change plan for ALTER INDEX ‹defaultdb›.‹public›.‹t›@‹foo
  │         ├── 1 element transitioning toward PUBLIC
  │         │    └── ABSENT → PUBLIC IndexZoneConfig:{DescID: 104 (t), IndexID: 2 (foo), SeqNum: 1}
  │         └── 1 Mutation operation
- │              └── AddIndexZoneConfig {"TableID":104}
+ │              └── AddIndexZoneConfig {"SubzoneIndexToDelete":-1,"TableID":104}
  └── PreCommitPhase
       ├── Stage 1 of 2 in PreCommitPhase
       │    ├── 1 element transitioning toward PUBLIC
@@ -22,4 +22,4 @@ Schema change plan for ALTER INDEX ‹defaultdb›.‹public›.‹t›@‹foo
            ├── 1 element transitioning toward PUBLIC
            │    └── ABSENT → PUBLIC IndexZoneConfig:{DescID: 104 (t), IndexID: 2 (foo), SeqNum: 1}
            └── 1 Mutation operation
-                └── AddIndexZoneConfig {"TableID":104}
+                └── AddIndexZoneConfig {"SubzoneIndexToDelete":-1,"TableID":104}

pkg/ccl/schemachangerccl/testdata/end_to_end/alter_index_configure_zone_multiple/alter_index_configure_zone_multiple__statement_2_of_3.explain

@@ -12,7 +12,7 @@ Schema change plan for ALTER INDEX ‹defaultdb›.‹public›.‹t›@‹foo
  │         ├── 1 element transitioning toward PUBLIC
  │         │    └── ABSENT → PUBLIC IndexZoneConfig:{DescID: 104 (t), IndexID: 2 (foo), SeqNum: 2}
  │         └── 1 Mutation operation
- │              └── AddIndexZoneConfig {"TableID":104}
+ │              └── AddIndexZoneConfig {"SubzoneIndexToDelete":-1,"TableID":104}
  └── PreCommitPhase
       ├── Stage 1 of 2 in PreCommitPhase
       │    ├── 2 elements transitioning toward PUBLIC
@@ -25,5 +25,5 @@ Schema change plan for ALTER INDEX ‹defaultdb›.‹public›.‹t›@‹foo
            │    ├── ABSENT → PUBLIC IndexZoneConfig:{DescID: 104 (t), IndexID: 2 (foo), SeqNum: 1}
            │    └── ABSENT → PUBLIC IndexZoneConfig:{DescID: 104 (t), IndexID: 2 (foo), SeqNum: 2}
            └── 2 Mutation operations
-                ├── AddIndexZoneConfig {"TableID":104}
-                └── AddIndexZoneConfig {"TableID":104}
+                ├── AddIndexZoneConfig {"SubzoneIndexToDelete":-1,"TableID":104}
+                └── AddIndexZoneConfig {"SubzoneIndexToDelete":-1,"TableID":104}

pkg/ccl/schemachangerccl/testdata/end_to_end/alter_index_configure_zone_multiple/alter_index_configure_zone_multiple__statement_3_of_3.explain

@@ -13,7 +13,7 @@ Schema change plan for ALTER INDEX ‹defaultdb›.‹public›.‹t›@‹foo
  │         ├── 1 element transitioning toward PUBLIC
  │         │    └── ABSENT → PUBLIC IndexZoneConfig:{DescID: 104 (t), IndexID: 2 (foo), SeqNum: 3}
  │         └── 1 Mutation operation
- │              └── AddIndexZoneConfig {"TableID":104}
+ │              └── AddIndexZoneConfig {"SubzoneIndexToDelete":-1,"TableID":104}
  └── PreCommitPhase
       ├── Stage 1 of 2 in PreCommitPhase
       │    ├── 3 elements transitioning toward PUBLIC
@@ -28,6 +28,6 @@ Schema change plan for ALTER INDEX ‹defaultdb›.‹public›.‹t›@‹foo
            │    ├── ABSENT → PUBLIC IndexZoneConfig:{DescID: 104 (t), IndexID: 2 (foo), SeqNum: 2}
            │    └── ABSENT → PUBLIC IndexZoneConfig:{DescID: 104 (t), IndexID: 2 (foo), SeqNum: 3}
            └── 3 Mutation operations
-                ├── AddIndexZoneConfig {"TableID":104}
-                ├── AddIndexZoneConfig {"TableID":104}
-                └── AddIndexZoneConfig {"TableID":104}
+                ├── AddIndexZoneConfig {"SubzoneIndexToDelete":-1,"TableID":104}
+                ├── AddIndexZoneConfig {"SubzoneIndexToDelete":-1,"TableID":104}
+                └── AddIndexZoneConfig {"SubzoneIndexToDelete":-1,"TableID":104}

pkg/ccl/schemachangerccl/testdata/end_to_end/alter_partition_configure_zone/alter_partition_configure_zone.explain

@@ -16,7 +16,7 @@ Schema change plan for ALTER PARTITION ‹p1› OF INDEX ‹defaultdb›.‹publ
  │         ├── 1 element transitioning toward PUBLIC
  │         │    └── ABSENT → PUBLIC PartitionZoneConfig:{DescID: 104 (t), IndexID: 1 (t_pkey), SeqNum: 1, PartitionName: "p1"}
  │         └── 1 Mutation operation
- │              └── AddPartitionZoneConfig {"TableID":104}
+ │              └── AddPartitionZoneConfig {"SubzoneIndexToDelete":-1,"TableID":104}
  └── PreCommitPhase
       ├── Stage 1 of 2 in PreCommitPhase
       │    ├── 1 element transitioning toward PUBLIC
@@ -27,4 +27,4 @@ Schema change plan for ALTER PARTITION ‹p1› OF INDEX ‹defaultdb›.‹publ
            ├── 1 element transitioning toward PUBLIC
            │    └── ABSENT → PUBLIC PartitionZoneConfig:{DescID: 104 (t), IndexID: 1 (t_pkey), SeqNum: 1, PartitionName: "p1"}
            └── 1 Mutation operation
-                └── AddPartitionZoneConfig {"TableID":104}
+                └── AddPartitionZoneConfig {"SubzoneIndexToDelete":-1,"TableID":104}

pkg/ccl/schemachangerccl/testdata/end_to_end/alter_partition_configure_zone_discard/alter_partition_configure_zone_discard.definition

@@ -0,0 +1,16 @@
+setup
+CREATE TABLE t (
+    id INT PRIMARY KEY,
+    data STRING
+) PARTITION BY LIST (id) (
+    PARTITION p1 VALUES IN (1, 2, 3),
+    PARTITION p2 VALUES IN (4, 5, 6)
+);
+----
+
+test
+ALTER PARTITION p1 OF INDEX t@t_pkey CONFIGURE ZONE USING num_replicas = 11;
+ALTER PARTITION p1 OF INDEX t@t_pkey CONFIGURE ZONE USING num_replicas = 12;
+ALTER PARTITION p2 OF INDEX t@t_pkey CONFIGURE ZONE USING num_replicas = 10;
+ALTER PARTITION p1 OF INDEX t@t_pkey CONFIGURE ZONE DISCARD;
+----