github.com/cockroachdb/cockroach@v20.2.0-alpha.1+incompatible/pkg/sql/deallocate.go (about)

     1  // Copyright 2017 The Cockroach Authors.
     2  //
     3  // Use of this software is governed by the Business Source License
     4  // included in the file licenses/BSL.txt.
     5  //
     6  // As of the Change Date specified in that file, in accordance with
     7  // the Business Source License, use of this software will be governed
     8  // by the Apache License, Version 2.0, included in the file
     9  // licenses/APL.txt.
    10  
    11  package sql
    12  
    13  import (
    14  	"context"
    15  
    16  	"github.com/cockroachdb/cockroach/pkg/sql/pgwire/pgcode"
    17  	"github.com/cockroachdb/cockroach/pkg/sql/pgwire/pgerror"
    18  	"github.com/cockroachdb/cockroach/pkg/sql/sem/tree"
    19  )
    20  
    21  // Deallocate implements the DEALLOCATE statement.
    22  // See https://www.postgresql.org/docs/current/static/sql-deallocate.html for details.
    23  func (p *planner) Deallocate(ctx context.Context, s *tree.Deallocate) (planNode, error) {
    24  	if s.Name == "" {
    25  		p.preparedStatements.DeleteAll(ctx)
    26  	} else {
    27  		if found := p.preparedStatements.Delete(ctx, string(s.Name)); !found {
    28  			return nil, pgerror.Newf(pgcode.InvalidSQLStatementName,
    29  				"prepared statement %q does not exist", s.Name)
    30  		}
    31  	}
    32  	return newZeroNode(nil /* columns */), nil
    33  }