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See cockroachdb#19472 Release note (sql change): support COMMENT ON TABLE syntax
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| // Copyright 2018 The Cockroach Authors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or | ||
| // implied. See the License for the specific language governing | ||
| // permissions and limitations under the License. | ||
|
|
||
| package sql | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| "github.com/cockroachdb/cockroach/pkg/keys" | ||
| "github.com/cockroachdb/cockroach/pkg/sql/privilege" | ||
| "github.com/cockroachdb/cockroach/pkg/sql/sem/tree" | ||
| "github.com/cockroachdb/cockroach/pkg/sql/sqlbase" | ||
| ) | ||
|
|
||
| type commentOnTableNode struct { | ||
| n *tree.CommentOnTable | ||
| tableDesc *MutableTableDescriptor | ||
| dbDesc *sqlbase.DatabaseDescriptor | ||
| } | ||
|
|
||
| // CommentOnTable add comment on a table. | ||
| // Privileges: CREATE on table. | ||
| // notes: postgres requires CREATE on the table. | ||
| // mysql requires ALTER, CREATE, INSERT on the table. | ||
| func (p *planner) CommentOnTable(ctx context.Context, n *tree.CommentOnTable) (planNode, error) { | ||
| tableDesc, err := p.ResolveMutableTableDescriptor(ctx, &n.Table, true, requireTableDesc) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if tableDesc == nil { | ||
| return newZeroNode(nil /* columns */), nil | ||
| } | ||
|
|
||
| if err := p.CheckPrivilege(ctx, tableDesc, privilege.CREATE); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| dbDesc, err := getDatabaseDescByID( | ||
| ctx, | ||
| p.Txn(), | ||
| tableDesc.ParentID) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &commentOnTableNode{n: n, tableDesc: tableDesc, dbDesc: dbDesc}, nil | ||
| } | ||
|
|
||
| func (n *commentOnTableNode) startExec(params runParams) error { | ||
| h := makeOidHasher() | ||
| oid := h.TableOid(n.dbDesc, tree.PublicSchema, n.tableDesc.TableDesc()) | ||
|
|
||
| if n.n.Comment != nil { | ||
| _, err := params.p.extendedEvalCtx.ExecCfg.InternalExecutor.Exec( | ||
| params.ctx, | ||
| "upsert-comment", | ||
| params.p.Txn(), | ||
| "UPSERT INTO system.comments VALUES ($1, $2, 0, $3)", | ||
| keys.TableCommentType, | ||
| oid.DInt, | ||
| *n.n.Comment) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } else { | ||
| _, err := params.p.extendedEvalCtx.ExecCfg.InternalExecutor.Exec( | ||
| params.ctx, | ||
| "delete-comment", | ||
| params.p.Txn(), | ||
| "DELETE FROM system.comments WHERE type=$1 AND object_id=$2 AND sub_id=0", | ||
| keys.TableCommentType, | ||
| oid.DInt) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
|
|
||
| return MakeEventLogger(params.extendedEvalCtx.ExecCfg).InsertEventRecord( | ||
| params.ctx, | ||
| params.p.txn, | ||
| EventLogCommentOnTable, | ||
| int32(n.tableDesc.ID), | ||
| int32(params.extendedEvalCtx.NodeID), | ||
| struct { | ||
| TableName string | ||
| Statement string | ||
| User string | ||
| Comment *string | ||
| }{ | ||
| n.n.Table.FQString(), | ||
| n.n.String(), | ||
| params.SessionData().User, | ||
| n.n.Comment}, | ||
| ) | ||
| } | ||
|
|
||
| func (n *commentOnTableNode) Next(runParams) (bool, error) { return false, nil } | ||
| func (n *commentOnTableNode) Values() tree.Datums { return tree.Datums{} } | ||
| func (n *commentOnTableNode) Close(context.Context) {} |
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