wehub-resource-sync
143 lines
3.8 KiB
Go
143 lines
3.8 KiB
Go
// Copyright 2023 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 ast
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import (
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"strings"
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"github.com/cockroachdb/errors"
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vitess "github.com/dolthub/vitess/go/vt/sqlparser"
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"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
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"github.com/dolthub/doltgresql/server/auth"
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pgexprs "github.com/dolthub/doltgresql/server/expression"
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)
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// nodeFuncExpr handles *tree.FuncExpr nodes.
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func nodeFuncExpr(ctx *Context, node *tree.FuncExpr) (vitess.Expr, error) {
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if node == nil {
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return nil, nil
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}
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if node.Filter != nil {
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return nil, errors.Errorf("function filters are not yet supported")
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}
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if node.AggType == tree.OrderedSetAgg {
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return nil, errors.Errorf("WITHIN GROUP is not yet supported")
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}
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var qualifier vitess.TableIdent
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var name vitess.ColIdent
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switch funcRef := node.Func.FunctionReference.(type) {
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case *tree.FunctionDefinition:
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name = vitess.NewColIdent(funcRef.Name)
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case *tree.UnresolvedName:
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colName, err := unresolvedNameToColName(funcRef)
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if err != nil {
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return nil, err
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}
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qualifier = colName.Qualifier.Name
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name = colName.Name
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default:
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return nil, errors.Errorf("unknown function reference")
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}
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var distinct bool
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switch node.Type {
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case 0, tree.AllFuncType:
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distinct = false
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case tree.DistinctFuncType:
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distinct = true
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default:
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return nil, errors.Errorf("unknown function spec type %d", node.Type)
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}
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windowDef, err := nodeWindowDef(ctx, node.WindowDef)
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if err != nil {
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return nil, err
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}
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exprs, err := nodeExprsToSelectExprs(ctx, node.Exprs)
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if err != nil {
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return nil, err
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}
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switch strings.ToLower(name.String()) {
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// special case for string_agg, which maps to the mysql aggregate function group_concat
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case "string_agg":
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if len(node.Exprs) != 2 {
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return nil, errors.Errorf("string_agg requires two arguments")
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}
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sepString := ""
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if sep, ok := node.Exprs[1].(*tree.StrVal); ok {
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sepString = strings.Trim(sep.String(), "'")
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} else {
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// TODO: need to support this function in doltgres
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c, is := node.Exprs[1].(*tree.CastExpr)
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if !is && c.Type.SQLString() != "TEXT" {
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return nil, errors.Errorf("string_agg requires a string separator")
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}
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sepString = strings.Trim(c.Expr.String(), "'")
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}
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var orderBy vitess.OrderBy
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if len(node.OrderBy) > 0 {
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orderBy, err = nodeOrderBy(ctx, node.OrderBy)
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if err != nil {
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return nil, err
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}
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}
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return &vitess.GroupConcatExpr{
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Exprs: exprs[:1],
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Separator: vitess.Separator{
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SeparatorString: sepString,
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},
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OrderBy: orderBy,
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}, nil
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case "array_agg":
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var orderBy vitess.OrderBy
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if len(node.OrderBy) > 0 {
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orderBy, err = nodeOrderBy(ctx, node.OrderBy)
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if err != nil {
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return nil, err
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}
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}
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return &vitess.OrderedInjectedExpr{
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InjectedExpr: vitess.InjectedExpr{
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Expression: &pgexprs.ArrayAgg{Distinct: distinct},
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SelectExprChildren: exprs,
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Auth: vitess.AuthInformation{},
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},
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OrderBy: orderBy,
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}, nil
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}
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if len(node.OrderBy) > 0 {
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return nil, errors.Errorf("function ORDER BY is not yet supported")
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}
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return &vitess.FuncExpr{
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Qualifier: qualifier,
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Name: name,
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Distinct: distinct,
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Exprs: exprs,
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Over: (*vitess.Over)(windowDef),
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Auth: vitess.AuthInformation{
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AuthType: auth.AuthType_EXECUTE,
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TargetType: auth.AuthTargetType_FunctionIdentifiers,
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TargetNames: []string{qualifier.String(), name.String()},
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},
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}, nil
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}
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