wehub-resource-sync
137 lines
4.1 KiB
Go
137 lines
4.1 KiB
Go
// Copyright 2025 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/dolthub/go-mysql-server/sql"
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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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// initArrayPosition registers the functions to the catalog.
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func initArrayPosition() {
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framework.RegisterFunction(array_position_anyarray_anyelement)
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framework.RegisterFunction(array_position_anyarray_anyelement_int32)
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framework.RegisterFunction(array_positions_anyarray_anyelement)
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}
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// array_position_anyarray_anyelement represents the PostgreSQL function of the same name, taking the same parameters.
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var array_position_anyarray_anyelement = framework.Function2{
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Name: "array_position",
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Return: pgtypes.Int32,
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Parameters: [2]*pgtypes.DoltgresType{pgtypes.AnyArray, pgtypes.AnyElement},
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Strict: false,
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Callable: func(ctx *sql.Context, t [3]*pgtypes.DoltgresType, val1 any, val2 any) (any, error) {
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if val1 == nil {
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return nil, nil
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}
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array := val1.([]any)
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searchElement := val2
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arrayType := t[0]
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baseType := arrayType.ArrayBaseType()
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// Search for the element starting from position 1 (1-indexed)
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for i, element := range array {
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cmp, err := baseType.Compare(ctx, element, searchElement)
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if err != nil {
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return nil, err
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}
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if cmp == 0 {
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return int32(i + 1), nil // PostgreSQL uses 1-indexed arrays
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}
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}
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// Element not found
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return nil, nil
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},
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}
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// array_position_anyarray_anyelement_int32 represents the PostgreSQL function of the same name, taking the same parameters.
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var array_position_anyarray_anyelement_int32 = framework.Function3{
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Name: "array_position",
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Return: pgtypes.Int32,
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Parameters: [3]*pgtypes.DoltgresType{pgtypes.AnyArray, pgtypes.AnyElement, pgtypes.Int32},
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Strict: false,
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Callable: func(ctx *sql.Context, t [4]*pgtypes.DoltgresType, val1 any, val2 any, val3 any) (any, error) {
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if val1 == nil {
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return nil, nil
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}
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array := val1.([]any)
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searchElement := val2
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start := val3.(int32)
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arrayType := t[0]
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baseType := arrayType.ArrayBaseType()
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// Convert 1-indexed start position to 0-indexed
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startIdx := int(start - 1)
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if startIdx < 0 {
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startIdx = 0
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}
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if startIdx >= len(array) {
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return nil, nil
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}
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// Search for the element starting from the specified position
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for i := startIdx; i < len(array); i++ {
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cmp, err := baseType.Compare(ctx, array[i], searchElement)
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if err != nil {
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return nil, err
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}
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if cmp == 0 {
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return int32(i + 1), nil // PostgreSQL uses 1-indexed arrays
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}
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}
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// Element not found
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return nil, nil
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},
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}
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// array_positions_anyarray_anyelement represents the PostgreSQL function of the same name, taking the same parameters.
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var array_positions_anyarray_anyelement = framework.Function2{
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Name: "array_positions",
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Return: pgtypes.Int32Array,
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Parameters: [2]*pgtypes.DoltgresType{pgtypes.AnyArray, pgtypes.AnyElement},
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Strict: false,
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Callable: func(ctx *sql.Context, t [3]*pgtypes.DoltgresType, val1 any, val2 any) (any, error) {
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if val1 == nil {
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return nil, nil
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}
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array := val1.([]any)
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searchElement := val2
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arrayType := t[0]
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baseType := arrayType.ArrayBaseType()
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var positions []any
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// Search for all occurrences of the element
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for i, element := range array {
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cmp, err := baseType.Compare(ctx, element, searchElement)
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if err != nil {
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return nil, err
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}
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if cmp == 0 {
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positions = append(positions, int32(i+1)) // PostgreSQL uses 1-indexed arrays
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}
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}
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// Return array of positions, or empty array if no matches
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return positions, nil
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},
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}
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