wehub-resource-sync
84 lines
3.1 KiB
Go
84 lines
3.1 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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"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/server/functions/framework"
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pgtypes "github.com/dolthub/doltgresql/server/types"
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)
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// initArrayToString registers the functions to the catalog.
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func initArrayToString() {
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framework.RegisterFunction(array_to_string_anyarray_text)
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framework.RegisterFunction(array_to_string_anyarray_text_text)
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}
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// array_to_string_anyarray_text represents the PostgreSQL array function taking 2 parameters.
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var array_to_string_anyarray_text = framework.Function2{
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Name: "array_to_string",
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Return: pgtypes.Text,
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Parameters: [2]*pgtypes.DoltgresType{pgtypes.AnyArray, pgtypes.Text},
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IsNonDeterministic: true,
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Strict: true,
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Callable: func(ctx *sql.Context, paramsAndReturn [3]*pgtypes.DoltgresType, val1, val2 any) (any, error) {
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arr := val1.([]any)
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delimiter := val2.(string)
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return getStringArrFromAnyArray(ctx, paramsAndReturn[0], arr, delimiter, nil)
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},
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}
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// array_to_string_anyarray_text_text represents the PostgreSQL array function taking 3 parameter.
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var array_to_string_anyarray_text_text = framework.Function3{
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Name: "array_to_string",
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Return: pgtypes.Text,
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Parameters: [3]*pgtypes.DoltgresType{pgtypes.AnyArray, pgtypes.Text, pgtypes.Text},
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IsNonDeterministic: true,
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Strict: false,
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Callable: func(ctx *sql.Context, paramsAndReturn [4]*pgtypes.DoltgresType, val1, val2, val3 any) (any, error) {
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if val1 == nil {
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return nil, errors.Errorf("could not determine polymorphic type because input has type unknown")
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} else if val2 == nil {
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return nil, nil
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}
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arr := val1.([]any)
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delimiter := val2.(string)
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return getStringArrFromAnyArray(ctx, paramsAndReturn[0], arr, delimiter, val3)
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},
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}
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// getStringArrFromAnyArray takes inputs of any array, delimiter and null entry replacement. It uses the IoOutput() of the
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// base type of the AnyArray type to get string representation of array elements.
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func getStringArrFromAnyArray(ctx *sql.Context, arrType *pgtypes.DoltgresType, arr []any, delimiter string, nullEntry any) (string, error) {
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baseType := arrType.ArrayBaseType()
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strs := make([]string, 0)
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for _, el := range arr {
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if el != nil {
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v, err := baseType.IoOutput(ctx, el)
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if err != nil {
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return "", err
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}
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strs = append(strs, v)
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} else if nullEntry != nil {
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strs = append(strs, nullEntry.(string))
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}
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}
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return strings.Join(strs, delimiter), nil
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}
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