wehub-resource-sync
115 lines
3.6 KiB
Go
115 lines
3.6 KiB
Go
// Copyright 2024 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package functions
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import (
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"fmt"
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"strings"
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"github.com/cockroachdb/errors"
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"github.com/dolthub/go-mysql-server/sql"
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"github.com/dolthub/doltgresql/core/id"
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"github.com/dolthub/doltgresql/server/functions/framework"
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pgtypes "github.com/dolthub/doltgresql/server/types"
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)
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// initPgGetIndexDef registers the functions to the catalog.
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func initPgGetIndexDef() {
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framework.RegisterFunction(pg_get_indexdef_oid)
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framework.RegisterFunction(pg_get_indexdef_oid_integer_bool)
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}
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// pg_get_indexdef_oid represents the PostgreSQL system catalog information function.
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var pg_get_indexdef_oid = framework.Function1{
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Name: "pg_get_indexdef",
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Return: pgtypes.Text,
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Parameters: [1]*pgtypes.DoltgresType{pgtypes.Oid},
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IsNonDeterministic: true,
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Strict: true,
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Callable: func(ctx *sql.Context, _ [2]*pgtypes.DoltgresType, val any) (any, error) {
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oidVal := val.(id.Id)
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result := ""
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err := RunCallback(ctx, oidVal, Callbacks{
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Index: func(ctx *sql.Context, schema ItemSchema, table ItemTable, index ItemIndex) (cont bool, err error) {
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result = buildIndexDef(index.Item, schema.Item.SchemaName())
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return false, nil
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},
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})
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if err != nil {
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return "", err
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}
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return result, nil
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},
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}
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// buildIndexDef generates a CREATE INDEX DDL statement for the given index.
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func buildIndexDef(index sql.Index, schemaName string) string {
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name := index.ID()
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using := strings.ToLower(index.IndexType())
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unique := ""
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if index.IsUnique() {
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unique = " UNIQUE"
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}
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cols := make([]string, len(index.Expressions()))
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for i, expr := range index.Expressions() {
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split := strings.Split(expr, ".")
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if len(split) > 1 {
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cols[i] = split[1]
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} else {
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cols[i] = expr
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}
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}
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colsStr := strings.Join(cols, ", ")
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def := fmt.Sprintf("CREATE%s INDEX %s ON %s.%s USING %s (%s)", unique, name, schemaName, index.Table(), using, colsStr)
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if pi, ok := index.(sql.PartialIndex); ok && pi.Predicate() != "" {
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def += " WHERE (" + pi.Predicate() + ")"
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}
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return def
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}
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// pg_get_indexdef_oid_integer_bool represents the PostgreSQL system catalog information function.
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var pg_get_indexdef_oid_integer_bool = framework.Function3{
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Name: "pg_get_indexdef",
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Return: pgtypes.Text,
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Parameters: [3]*pgtypes.DoltgresType{pgtypes.Oid, pgtypes.Int32, pgtypes.Bool},
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IsNonDeterministic: true,
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Strict: true,
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Callable: func(ctx *sql.Context, _ [4]*pgtypes.DoltgresType, val1, val2, val3 any) (any, error) {
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oidVal := val1.(id.Id)
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colNo := val2.(int32)
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pretty := val3.(bool)
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if pretty {
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return "", errors.Errorf("pretty printing is not yet supported")
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}
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err := RunCallback(ctx, oidVal, Callbacks{
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Index: func(ctx *sql.Context, schema ItemSchema, table ItemTable, index ItemIndex) (cont bool, err error) {
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exprs := index.Item.Expressions()
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if int(colNo) >= len(exprs) {
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return false, errors.Errorf("column not found")
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}
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// TODO: make `create index` statement
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return false, nil
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},
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})
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if err != nil {
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return "", err
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}
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return "", nil
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},
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}
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