wehub-resource-sync
89 lines
2.8 KiB
Go
89 lines
2.8 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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"math"
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"time"
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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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// initToTimestamp registers the functions to the catalog.
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func initToTimestamp() {
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framework.RegisterFunction(to_timestamp_float8)
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framework.RegisterFunction(to_timestamp_text_text)
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}
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// to_timestamp_float8 represents the PostgreSQL function of the same name, taking a Unix timestamp as float8.
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var to_timestamp_float8 = framework.Function1{
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Name: "to_timestamp",
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Return: pgtypes.TimestampTZ,
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Parameters: [1]*pgtypes.DoltgresType{pgtypes.Float64},
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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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timestamp := val.(float64)
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// Handle special values - PostgreSQL returns special strings for infinity
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if math.IsInf(timestamp, 1) {
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return nil, nil
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// TODO: handle special case
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//return "infinity", nil
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} else if math.IsInf(timestamp, -1) {
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return nil, nil
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// TODO: handle special case
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//return "-infinity", nil
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} else if math.IsNaN(timestamp) {
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return nil, errors.Errorf("timestamp cannot be NaN")
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}
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// Convert Unix timestamp to time.Time
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sec := int64(timestamp)
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nsec := int64((timestamp - float64(sec)) * 1e9)
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// Ensure nsec is positive for proper time handling
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if nsec < 0 {
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sec--
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nsec += 1e9
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}
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// Check for valid timestamp range (PostgreSQL limits)
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if timestamp < -210866803200 || timestamp > 9223372036.854775 {
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return nil, errors.Errorf("timestamp out of range")
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}
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return time.Unix(sec, nsec).UTC(), nil
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},
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}
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// to_timestamp_text_text represents the PostgreSQL function of the same name, taking text input and format pattern.
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var to_timestamp_text_text = framework.Function2{
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Name: "to_timestamp",
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Return: pgtypes.TimestampTZ,
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Parameters: [2]*pgtypes.DoltgresType{pgtypes.Text, pgtypes.Text},
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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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input := val1.(string)
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format := val2.(string)
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// Parse the timestamp using PostgreSQL format patterns
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return getDateTimeFromFormat(ctx, input, format)
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},
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}
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