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check.go
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check.go
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// Copyright 2016 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 (
"bytes"
"fmt"
"strings"
"github.com/pkg/errors"
"golang.org/x/net/context"
"github.com/cockroachdb/cockroach/pkg/sql/parser"
"github.com/cockroachdb/cockroach/pkg/sql/sqlbase"
"github.com/cockroachdb/cockroach/pkg/util/log"
)
type checkHelper struct {
exprs []parser.TypedExpr
cols []sqlbase.ColumnDescriptor
sourceInfo *dataSourceInfo
ivars []parser.IndexedVar
curSourceRow parser.Datums
}
func (c *checkHelper) init(
ctx context.Context, p *planner, tn *parser.TableName, tableDesc *sqlbase.TableDescriptor,
) error {
if len(tableDesc.Checks) == 0 {
return nil
}
c.cols = tableDesc.Columns
c.sourceInfo = newSourceInfoForSingleTable(
*tn, sqlbase.ResultColumnsFromColDescs(tableDesc.Columns),
)
c.exprs = make([]parser.TypedExpr, len(tableDesc.Checks))
exprStrings := make([]string, len(tableDesc.Checks))
for i, check := range tableDesc.Checks {
exprStrings[i] = check.Expr
}
exprs, err := parser.ParseExprs(exprStrings)
if err != nil {
return err
}
ivarHelper := parser.MakeIndexedVarHelper(c, len(c.cols))
for i, raw := range exprs {
typedExpr, err := p.analyzeExpr(ctx, raw, multiSourceInfo{c.sourceInfo}, ivarHelper,
parser.TypeBool, false, "")
if err != nil {
return err
}
c.exprs[i] = typedExpr
}
c.ivars = ivarHelper.GetIndexedVars()
c.curSourceRow = make(parser.Datums, len(c.cols))
return nil
}
// Set values in the IndexedVars used by the CHECK exprs.
// Any value not passed is set to NULL, unless `merge` is true, in which
// case it is left unchanged (allowing updating a subset of a row's values).
func (c *checkHelper) loadRow(
colIdx map[sqlbase.ColumnID]int, row parser.Datums, merge bool,
) error {
if len(c.exprs) == 0 {
return nil
}
// Populate IndexedVars.
for _, ivar := range c.ivars {
if ivar.Idx == invalidColIdx {
continue
}
ri, has := colIdx[c.cols[ivar.Idx].ID]
if has {
if row[ri] != parser.DNull {
expected, provided := ivar.ResolvedType(), row[ri].ResolvedType()
if !expected.Equivalent(provided) {
return errors.Errorf("%s value does not match CHECK expr type %s", provided, expected)
}
}
c.curSourceRow[ivar.Idx] = row[ri]
} else if !merge {
c.curSourceRow[ivar.Idx] = parser.DNull
}
}
return nil
}
// IndexedVarEval implements the parser.IndexedVarContainer interface.
func (c *checkHelper) IndexedVarEval(idx int, ctx *parser.EvalContext) (parser.Datum, error) {
return c.curSourceRow[idx].Eval(ctx)
}
// IndexedVarResolvedType implements the parser.IndexedVarContainer interface.
func (c *checkHelper) IndexedVarResolvedType(idx int) parser.Type {
return c.sourceInfo.sourceColumns[idx].Typ
}
// IndexedVarFormat implements the parser.IndexedVarContainer interface.
func (c *checkHelper) IndexedVarFormat(buf *bytes.Buffer, f parser.FmtFlags, idx int) {
c.sourceInfo.FormatVar(buf, f, idx)
}
func (c *checkHelper) check(ctx *parser.EvalContext) error {
for _, expr := range c.exprs {
if d, err := expr.Eval(ctx); err != nil {
return err
} else if res, err := parser.GetBool(d); err != nil {
return err
} else if !res && d != parser.DNull {
// Failed to satisfy CHECK constraint.
return fmt.Errorf("failed to satisfy CHECK constraint (%s)", expr)
}
}
return nil
}
func (p *planner) validateCheckExpr(
ctx context.Context,
exprStr string,
tableName parser.TableExpr,
tableDesc *sqlbase.TableDescriptor,
) error {
expr, err := parser.ParseExpr(exprStr)
if err != nil {
return err
}
sel := &parser.SelectClause{
Exprs: sqlbase.ColumnsSelectors(tableDesc.Columns),
From: &parser.From{Tables: parser.TableExprs{tableName}},
Where: &parser.Where{Expr: &parser.NotExpr{Expr: expr}},
}
lim := &parser.Limit{Count: parser.NewDInt(1)}
// This could potentially use a variant of planner.SelectClause that could
// use the tableDesc we have, but this is a rare operation and be benefit
// would be marginal compared to the work of the actual query, so the added
// complexity seems unjustified.
rows, err := p.SelectClause(ctx, sel, nil, lim, nil, publicColumns)
if err != nil {
return err
}
rows, err = p.optimizePlan(ctx, rows, allColumns(rows))
if err != nil {
return err
}
if err := p.startPlan(ctx, rows); err != nil {
return err
}
next, err := rows.Next(ctx)
if err != nil {
return err
}
if next {
return errors.Errorf("validation of CHECK %q failed on row: %s",
expr.String(), labeledRowValues(tableDesc.Columns, rows.Values()))
}
return nil
}
func (p *planner) validateForeignKey(
ctx context.Context, srcTable *sqlbase.TableDescriptor, srcIdx *sqlbase.IndexDescriptor,
) error {
targetTable, err := sqlbase.GetTableDescFromID(ctx, p.txn, srcIdx.ForeignKey.Table)
if err != nil {
return err
}
targetIdx, err := targetTable.FindIndexByID(srcIdx.ForeignKey.Index)
if err != nil {
return err
}
srcName, err := p.getQualifiedTableName(ctx, srcTable)
if err != nil {
return err
}
targetName, err := p.getQualifiedTableName(ctx, targetTable)
if err != nil {
return err
}
escape := func(s string) string {
return parser.Name(s).String()
}
prefix := len(srcIdx.ColumnNames)
if p := len(targetIdx.ColumnNames); p < prefix {
prefix = p
}
srcCols, targetCols := make([]string, prefix), make([]string, prefix)
join, where := make([]string, prefix), make([]string, prefix)
for i := 0; i < prefix; i++ {
srcCols[i] = fmt.Sprintf("s.%s", escape(srcIdx.ColumnNames[i]))
targetCols[i] = fmt.Sprintf("t.%s", escape(targetIdx.ColumnNames[i]))
join[i] = fmt.Sprintf("(%s = %s OR (%s IS NULL AND %s IS NULL))",
srcCols[i], targetCols[i], srcCols[i], targetCols[i])
where[i] = fmt.Sprintf("(%s IS NOT NULL AND %s IS NULL)", srcCols[i], targetCols[i])
}
query := fmt.Sprintf(
`SELECT %s FROM %s@%s AS s LEFT OUTER JOIN %s@%s AS t ON %s WHERE %s LIMIT 1`,
strings.Join(srcCols, ", "),
srcName, escape(srcIdx.Name), targetName, escape(targetIdx.Name),
strings.Join(join, " AND "),
strings.Join(where, " OR "),
)
log.Infof(ctx, "Validating FK %q (%q [%v] -> %q [%v]) with query %q",
srcIdx.ForeignKey.Name,
srcTable.Name, srcCols, targetTable.Name, targetCols,
query,
)
values, err := p.queryRows(ctx, query)
if err != nil {
return err
}
if len(values) > 0 {
var pairs bytes.Buffer
for i := range values[0] {
if i > 0 {
pairs.WriteString(", ")
}
pairs.WriteString(fmt.Sprintf("%s=%v", srcIdx.ColumnNames[i], values[0][i]))
}
return errors.Errorf("foreign key violation: %q row %s has no match in %q",
srcTable.Name, pairs.String(), targetTable.Name)
}
return nil
}