chore: import upstream snapshot with attribution
This commit is contained in:
wehub-resource-sync
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// 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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"fmt"
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"strings"
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"time"
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"github.com/dolthub/go-mysql-server/sql"
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"github.com/jackc/pgtype"
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"github.com/dolthub/doltgresql/core"
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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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"github.com/dolthub/doltgresql/utils"
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)
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// initTimestamp registers the functions to the catalog.
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func initTimestamp() {
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framework.RegisterFunction(timestamp_in)
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framework.RegisterFunction(timestamp_out)
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framework.RegisterFunction(timestamp_recv)
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framework.RegisterFunction(timestamp_send)
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framework.RegisterFunction(timestamptypmodin)
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framework.RegisterFunction(timestamptypmodout)
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framework.RegisterFunction(timestamp_cmp)
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}
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// timestamp_in represents the PostgreSQL function of timestamp type IO input.
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var timestamp_in = framework.Function3{
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Name: "timestamp_in",
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Return: pgtypes.Timestamp,
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Parameters: [3]*pgtypes.DoltgresType{pgtypes.Cstring, pgtypes.Oid, pgtypes.Int32},
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Strict: true,
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Callable: func(ctx *sql.Context, _ [4]*pgtypes.DoltgresType, val1, val2, val3 any) (any, error) {
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input := val1.(string)
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//oid := val2.(id.Id)
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//typmod := val3.(int32)
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// TODO: decode typmod to precision
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p := 6
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t, _, err := tree.ParseDTimestamp(nil, input, tree.TimeFamilyPrecisionToRoundDuration(int32(p)))
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if err != nil {
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return nil, err
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}
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return t.Time, nil
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},
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}
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// timestamp_out represents the PostgreSQL function of timestamp type IO output.
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var timestamp_out = framework.Function1{
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Name: "timestamp_out",
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Return: pgtypes.Cstring,
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Parameters: [1]*pgtypes.DoltgresType{pgtypes.Timestamp},
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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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t := val.(time.Time)
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return FormatDateTimeWithBC(t, getLayoutStringFormat(ctx, false), false), nil
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},
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}
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// timestamp_recv represents the PostgreSQL function of timestamp type IO receive.
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var timestamp_recv = framework.Function3{
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Name: "timestamp_recv",
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Return: pgtypes.Timestamp,
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Parameters: [3]*pgtypes.DoltgresType{pgtypes.Internal, pgtypes.Oid, pgtypes.Int32},
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Strict: true,
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Callable: func(ctx *sql.Context, _ [4]*pgtypes.DoltgresType, val1, val2, val3 any) (any, error) {
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data := val1.([]byte)
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if data == nil {
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return nil, nil
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}
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var out pgtype.Timestamp
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err := out.DecodeBinary(nil, data)
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if err != nil {
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return nil, err
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}
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return out.Time, nil
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},
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}
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// timestamp_send represents the PostgreSQL function of timestamp type IO send.
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var timestamp_send = framework.Function1{
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Name: "timestamp_send",
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Return: pgtypes.Bytea,
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Parameters: [1]*pgtypes.DoltgresType{pgtypes.Timestamp},
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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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postgresEpoch := time.UnixMilli(946684800000).UTC() // Jan 1, 2000 @ Midnight
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deltaInMicroseconds := val.(time.Time).UTC().UnixMicro() - postgresEpoch.UnixMicro()
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writer := utils.NewWireWriter()
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writer.WriteInt64(deltaInMicroseconds)
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return writer.BufferData(), nil
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},
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}
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// timestamptypmodin represents the PostgreSQL function of timestamp type IO typmod input.
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var timestamptypmodin = framework.Function1{
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Name: "timestamptypmodin",
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Return: pgtypes.Int32,
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Parameters: [1]*pgtypes.DoltgresType{pgtypes.CstringArray},
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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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// TODO: typmod=(precision<<16)∣scale
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return nil, nil
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},
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}
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// timestamptypmodout represents the PostgreSQL function of timestamp type IO typmod output.
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var timestamptypmodout = framework.Function1{
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Name: "timestamptypmodout",
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Return: pgtypes.Cstring,
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Parameters: [1]*pgtypes.DoltgresType{pgtypes.Int32},
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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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// TODO
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// Precision = typmod & 0xFFFF
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// Scale = (typmod >> 16) & 0xFFFF
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return nil, nil
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},
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}
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// timestamp_cmp represents the PostgreSQL function of timestamp type compare.
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var timestamp_cmp = framework.Function2{
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Name: "timestamp_cmp",
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Return: pgtypes.Int32,
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Parameters: [2]*pgtypes.DoltgresType{pgtypes.Timestamp, pgtypes.Timestamp},
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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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ab := val1.(time.Time)
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bb := val2.(time.Time)
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return int32(ab.Compare(bb)), nil
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},
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}
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// https://www.postgresql.org/docs/15/datatype-datetime.html
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const (
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DateStyleISO = "ISO"
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DateStyleSQL = "SQL"
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DateStylePostgres = "Postgres"
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DateStyleGerman = "German"
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)
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// getDateStyleOutputFormat returns the format layout for date/time values defined in the 'DateStyle' configuration parameter.
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func getDateStyleOutputFormat(ctx *sql.Context) string {
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// TODO: this is expensive, we should only do this once for each query
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format := DateStyleISO // default
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if ctx == nil {
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return format
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}
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if cachedFormat, err := core.GetDateStyleOutputFormat(ctx); err == nil && cachedFormat != "" {
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return cachedFormat
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}
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val, err := ctx.GetSessionVariable(ctx, "datestyle")
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if err != nil {
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return format
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}
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defer func() {
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_ = core.SetDateStyleOutputFormat(ctx, format)
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}()
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values := strings.Split(strings.ReplaceAll(val.(string), " ", ""), ",")
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for _, value := range values {
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switch value {
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case DateStyleISO, DateStyleSQL, DateStylePostgres, DateStyleGerman:
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format = value
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return format
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}
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}
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return format
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}
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const (
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// ISO is ISO 8601, SQL standard
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dateStyleFormat_ISO = "2006-01-02 15:04:05.999999"
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dateStyleFormatDateOnly_ISO = "2006-01-02"
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// SQL is traditional style
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dateStyleFormat_SQL = "01/02/2006 15:04:05.999999"
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dateStyleFormatDateOnly_SQL = "01/02/2006"
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// Postgres is original style
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dateStyleFormat_Postgres = "Mon Jan 02 15:04:05.999999 2006"
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dateStyleFormatDateOnly_Postgres = "Mon Jan 02 2006"
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// regional style
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dateStyleFormat_German = "02.01.2006 15:04:05.999999"
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dateStyleFormatDateOnly_German = "02.01.2006"
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)
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func getLayoutStringFormat(ctx *sql.Context, dateOnly bool) string {
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layout := getDateStyleOutputFormat(ctx)
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switch layout {
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case DateStyleISO:
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if dateOnly {
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return dateStyleFormatDateOnly_ISO
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}
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return dateStyleFormat_ISO
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case DateStyleSQL:
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if dateOnly {
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return dateStyleFormatDateOnly_SQL
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}
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return dateStyleFormat_SQL
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case DateStylePostgres:
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if dateOnly {
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return dateStyleFormatDateOnly_Postgres
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}
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return dateStyleFormat_Postgres
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case DateStyleGerman:
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if dateOnly {
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return dateStyleFormatDateOnly_German
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}
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return dateStyleFormat_German
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}
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// shouldn't happen but return default
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if dateOnly {
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return dateStyleFormatDateOnly_ISO
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}
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return dateStyleFormat_ISO
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}
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// FormatDateTimeWithBC formats a time.Time that may represent BC dates (negative years)
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// PostgreSQL represents BC years as negative years in time.Time, but Go's Format() doesn't handle this correctly
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// tz is optional timezone value to be appended to formatted value
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func FormatDateTimeWithBC(t time.Time, layout string, hasTZ bool) string {
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year := t.Year()
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isBC := year <= 0
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var formattedTime string
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if isBC {
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// Convert from PostgreSQL's BC representation to positive year for formatting
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// PostgreSQL: year 0 = 1 BC, year -1 = 2 BC, etc.
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absYear := 1 - year
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// Create a new time with the positive year for formatting
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positiveTime := time.Date(absYear, t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second(), t.Nanosecond(), t.Location())
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// Convert the negative year to positive year to get formatted result, but it creates issue on
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// the day of week value, so we need to get day of the week value from original negative time value.
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if strings.HasPrefix(layout, "Mon") {
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formattedTime = fmt.Sprintf("%s%s", t.Format("Mon"), positiveTime.Format(strings.TrimPrefix(layout, "Mon")))
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} else {
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// Format with the positive year, then append " BC"
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formattedTime = positiveTime.Format(layout)
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}
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} else {
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// For AD years (positive), use normal formatting
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formattedTime = t.Format(layout)
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}
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if hasTZ {
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name, offset := t.Zone()
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if strings.HasPrefix(layout, "Mon") {
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// Postgres doesn't show timezone for ones that don't have timezone abbreviation.
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if name != "" {
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name = t.Format("MST")
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}
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formattedTime += fmt.Sprintf(" %s", name)
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} else {
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if offset%3600 != 0 {
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formattedTime += t.Format("-07:00")
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} else {
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formattedTime += t.Format("-07")
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}
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}
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}
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if isBC {
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return formattedTime + " BC"
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}
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return formattedTime
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}
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