wehub-resource-sync
105 lines
3.7 KiB
Go
105 lines
3.7 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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"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/postgres/parser/parser"
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"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
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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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// initPgGetViewDef registers the functions to the catalog.
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func initPgGetViewDef() {
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framework.RegisterFunction(pg_get_viewdef_oid)
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framework.RegisterFunction(pg_get_viewdef_oid_bool)
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framework.RegisterFunction(pg_get_viewdef_oid_int)
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}
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// pg_get_viewdef_oid represents the PostgreSQL system catalog information function taking 1 parameter.
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var pg_get_viewdef_oid = framework.Function1{
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Name: "pg_get_viewdef",
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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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return getViewDef(ctx, oidVal)
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},
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}
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// pg_get_viewdef_oid_bool represents the PostgreSQL system catalog information function taking 2 parameters.
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var pg_get_viewdef_oid_bool = framework.Function2{
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Name: "pg_get_viewdef",
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Return: pgtypes.Text,
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Parameters: [2]*pgtypes.DoltgresType{pgtypes.Oid, pgtypes.Bool},
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IsNonDeterministic: true,
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Strict: true,
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Callable: func(ctx *sql.Context, _ [3]*pgtypes.DoltgresType, val1, val2 any) (any, error) {
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oidVal := val1.(id.Id)
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// TODO: pretty printing is not yet supported
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return getViewDef(ctx, oidVal)
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},
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}
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// pg_get_viewdef_oid_int represents the PostgreSQL system catalog information function taking 2 parameters.
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var pg_get_viewdef_oid_int = framework.Function2{
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Name: "pg_get_viewdef",
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Return: pgtypes.Text,
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Parameters: [2]*pgtypes.DoltgresType{pgtypes.Oid, pgtypes.Int64},
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IsNonDeterministic: true,
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Strict: true,
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Callable: func(ctx *sql.Context, _ [3]*pgtypes.DoltgresType, val1, val2 any) (any, error) {
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// TODO: prettyprint is implied, not yet supported
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// TODO: lines with fields are wrapped to specified number of columns
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return "", errors.Errorf("not yet supported")
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},
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}
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// getViewDef takes oid of view and returns the text definition of underlying SELECT statement.
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func getViewDef(ctx *sql.Context, oidVal id.Id) (string, error) {
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var result string
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err := RunCallback(ctx, oidVal, Callbacks{
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View: func(ctx *sql.Context, sch ItemSchema, view ItemView) (cont bool, err error) {
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result = view.Item.TextDefinition
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if result == "" {
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stmts, err := parser.Parse(view.Item.CreateViewStatement)
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if err != nil {
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return false, err
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}
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if len(stmts) == 0 {
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return false, errors.Errorf("expected CREATE VIEW statement, got none")
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}
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cv, ok := stmts[0].AST.(*tree.CreateView)
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if !ok {
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return false, errors.Errorf("expected CREATE VIEW statement, got %s", stmts[0].SQL)
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}
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result = cv.AsSource.String()
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}
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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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