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expr.go
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/
expr.go
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// Copyright 2023 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ast
import (
"fmt"
"go/constant"
"strings"
"github.com/dolthub/go-mysql-server/sql/expression"
vitess "github.com/dolthub/vitess/go/vt/sqlparser"
"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
pgexprs "github.com/dolthub/doltgresql/server/expression"
"github.com/dolthub/doltgresql/server/functions/framework"
pgtypes "github.com/dolthub/doltgresql/server/types"
)
// nodeExprs handles tree.Exprs nodes.
func nodeExprs(node tree.Exprs) (vitess.Exprs, error) {
if len(node) == 0 {
return nil, nil
}
exprs := make(vitess.Exprs, len(node))
for i := range node {
var err error
if exprs[i], err = nodeExpr(node[i]); err != nil {
return nil, err
}
}
return exprs, nil
}
// nodeCompositeDatum handles tree.CompositeDatum nodes.
func nodeCompositeDatum(node tree.CompositeDatum) (vitess.Expr, error) {
return nodeExpr(node)
}
// nodeConstant handles tree.Constant nodes.
func nodeConstant(node tree.Constant) (vitess.Expr, error) {
return nodeExpr(node)
}
// nodeDatum handles tree.Datum nodes.
func nodeDatum(node tree.Datum) (vitess.Expr, error) {
return nodeExpr(node)
}
// nodeSubqueryExpr handles tree.SubqueryExpr nodes.
func nodeSubqueryExpr(node tree.SubqueryExpr) (vitess.Expr, error) {
return nodeExpr(node)
}
// nodeTypedExpr handles tree.TypedExpr nodes.
func nodeTypedExpr(node tree.TypedExpr) (vitess.Expr, error) {
return nodeExpr(node)
}
// nodeVariableExpr handles tree.VariableExpr nodes.
func nodeVariableExpr(node tree.VariableExpr) (vitess.Expr, error) {
return nodeExpr(node)
}
// nodeVarName handles tree.VarName nodes.
func nodeVarName(node tree.VarName) (vitess.Expr, error) {
return nodeExpr(node)
}
// nodeExpr handles tree.Expr nodes.
func nodeExpr(node tree.Expr) (vitess.Expr, error) {
switch node := node.(type) {
case *tree.AllColumnsSelector:
return nil, fmt.Errorf("table.* syntax is not yet supported in this context")
case *tree.AndExpr:
left, err := nodeExpr(node.Left)
if err != nil {
return nil, err
}
right, err := nodeExpr(node.Right)
if err != nil {
return nil, err
}
return &vitess.AndExpr{
Left: left,
Right: right,
}, nil
case *tree.AnnotateTypeExpr:
return nil, fmt.Errorf("ANNOTATE_TYPE is not yet supported")
case *tree.Array:
unresolvedChildren := make([]vitess.Expr, len(node.Exprs))
var coercedType pgtypes.DoltgresType
if node.HasResolvedType() {
_, resolvedType, err := nodeResolvableTypeReference(node.ResolvedType())
if err != nil {
return nil, err
}
if arrayType, ok := resolvedType.(pgtypes.DoltgresArrayType); ok {
coercedType = arrayType
} else {
return nil, fmt.Errorf("array has invalid resolved type")
}
}
for i, arrayExpr := range node.Exprs {
var err error
unresolvedChildren[i], err = nodeExpr(arrayExpr)
if err != nil {
return nil, err
}
}
arrayExpr, err := pgexprs.NewArray(coercedType)
if err != nil {
return nil, err
}
return vitess.InjectedExpr{
Expression: arrayExpr,
Children: unresolvedChildren,
}, nil
case *tree.ArrayFlatten:
return nil, fmt.Errorf("flattening arrays is not yet supported")
case *tree.BinaryExpr:
left, err := nodeExpr(node.Left)
if err != nil {
return nil, err
}
right, err := nodeExpr(node.Right)
if err != nil {
return nil, err
}
var operator framework.Operator
switch node.Operator {
case tree.Bitand:
operator = framework.Operator_BinaryBitAnd
case tree.Bitor:
operator = framework.Operator_BinaryBitOr
case tree.Bitxor:
operator = framework.Operator_BinaryBitXor
case tree.Plus:
operator = framework.Operator_BinaryPlus
case tree.Minus:
operator = framework.Operator_BinaryMinus
case tree.Mult:
operator = framework.Operator_BinaryMultiply
case tree.Div:
operator = framework.Operator_BinaryDivide
case tree.FloorDiv:
//TODO: replace with floor divide function
return nil, fmt.Errorf("the floor divide operator is not yet supported")
case tree.Mod:
operator = framework.Operator_BinaryMod
case tree.Pow:
//TODO: replace with power function
return nil, fmt.Errorf("the power operator is not yet supported")
case tree.Concat:
//TODO: replace with concat function
return nil, fmt.Errorf("the concat operator is not yet supported")
case tree.LShift:
operator = framework.Operator_BinaryShiftLeft
case tree.RShift:
operator = framework.Operator_BinaryShiftRight
case tree.JSONFetchVal:
return nil, fmt.Errorf("JSON operators are not yet supported")
case tree.JSONFetchText:
return nil, fmt.Errorf("JSON operators are not yet supported")
case tree.JSONFetchValPath:
return nil, fmt.Errorf("JSON operators are not yet supported")
case tree.JSONFetchTextPath:
return nil, fmt.Errorf("JSON operators are not yet supported")
default:
return nil, fmt.Errorf("the binary operator used is not yet supported")
}
return vitess.InjectedExpr{
Expression: pgexprs.NewBinaryOperator(operator),
Children: vitess.Exprs{left, right},
}, nil
case *tree.CaseExpr:
expr, err := nodeExpr(node.Expr)
if err != nil {
return nil, err
}
whens := make([]*vitess.When, len(node.Whens))
for i := range node.Whens {
val, err := nodeExpr(node.Whens[i].Val)
if err != nil {
return nil, err
}
cond, err := nodeExpr(node.Whens[i].Cond)
if err != nil {
return nil, err
}
whens[i] = &vitess.When{
Val: val,
Cond: cond,
}
}
else_, err := nodeExpr(node.Else)
if err != nil {
return nil, err
}
return &vitess.CaseExpr{
Expr: expr,
Whens: whens,
Else: else_,
}, nil
case *tree.CastExpr:
expr, err := nodeExpr(node.Expr)
if err != nil {
return nil, err
}
switch node.SyntaxMode {
case tree.CastExplicit, tree.CastShort:
// Both of these are acceptable
case tree.CastPrepend:
return nil, fmt.Errorf("typed literals are not yet supported")
default:
return nil, fmt.Errorf("unknown cast syntax")
}
convertType, resolvedType, err := nodeResolvableTypeReference(node.Type)
if err != nil {
return nil, err
}
// If we have the resolved type, then we've got a Doltgres type instead of a GMS type
if resolvedType != nil {
cast, err := pgexprs.NewCast(resolvedType)
if err != nil {
return nil, err
}
return vitess.InjectedExpr{
Expression: cast,
Children: vitess.Exprs{expr},
}, nil
} else {
convertType, err = translateConvertType(convertType)
if err != nil {
return nil, err
}
return &vitess.ConvertExpr{
Name: "CAST",
Expr: expr,
Type: convertType,
}, nil
}
case *tree.CoalesceExpr:
exprs, err := nodeExprsToSelectExprs(node.Exprs)
if err != nil {
return nil, err
}
return &vitess.FuncExpr{
Name: vitess.NewColIdent("COALESCE"),
Exprs: exprs,
}, nil
case *tree.CollateExpr:
return nil, fmt.Errorf("collations are not yet supported")
case *tree.ColumnAccessExpr:
return nil, fmt.Errorf("(E).x is not yet supported")
case *tree.ColumnItem:
var tableName vitess.TableName
if node.TableName != nil {
if node.TableName.NumParts > 1 {
return nil, fmt.Errorf("referencing items outside the schema or database is not yet supported")
}
tableName.Name = vitess.NewTableIdent(node.TableName.Parts[0])
}
return &vitess.ColName{
Name: vitess.NewColIdent(string(node.ColumnName)),
Qualifier: tableName,
}, nil
case *tree.CommentOnColumn:
return nil, fmt.Errorf("comment on column is not yet supported")
case *tree.ComparisonExpr:
left, err := nodeExpr(node.Left)
if err != nil {
return nil, err
}
right, err := nodeExpr(node.Right)
if err != nil {
return nil, err
}
var operator string
switch node.Operator {
case tree.EQ:
operator = vitess.EqualStr
case tree.LT:
operator = vitess.LessThanStr
case tree.GT:
operator = vitess.GreaterThanStr
case tree.LE:
operator = vitess.LessEqualStr
case tree.GE:
operator = vitess.GreaterEqualStr
case tree.NE:
operator = vitess.NotEqualStr
case tree.In:
operator = vitess.InStr
case tree.NotIn:
operator = vitess.NotInStr
case tree.Like:
operator = vitess.LikeStr
case tree.NotLike:
operator = vitess.NotLikeStr
case tree.ILike:
return nil, fmt.Errorf("ILIKE is not yet supported")
case tree.NotILike:
return nil, fmt.Errorf("ILIKE is not yet supported")
case tree.SimilarTo:
return nil, fmt.Errorf("similar to is not yet supported")
case tree.NotSimilarTo:
return nil, fmt.Errorf("similar to is not yet supported")
case tree.RegMatch:
operator = vitess.RegexpStr
case tree.NotRegMatch:
operator = vitess.NotRegexpStr
case tree.RegIMatch:
return nil, fmt.Errorf("~* is not yet supported")
case tree.NotRegIMatch:
return nil, fmt.Errorf("~* is not yet supported")
case tree.TextSearchMatch:
return nil, fmt.Errorf("@@ is not yet supported")
case tree.IsDistinctFrom:
return nil, fmt.Errorf("IS DISTINCT FROM is not yet supported")
case tree.IsNotDistinctFrom:
return nil, fmt.Errorf("IS NOT DISTINCT FROM is not yet supported")
case tree.Contains:
return nil, fmt.Errorf("@> is not yet supported")
case tree.ContainedBy:
return nil, fmt.Errorf("<@ is not yet supported")
case tree.JSONExists:
return nil, fmt.Errorf("? is not yet supported")
case tree.JSONSomeExists:
return nil, fmt.Errorf("?| is not yet supported")
case tree.JSONAllExists:
return nil, fmt.Errorf("?& is not yet supported")
case tree.Overlaps:
return nil, fmt.Errorf("&& is not yet supported")
case tree.Any:
return nil, fmt.Errorf("ANY is not yet supported")
case tree.Some:
return nil, fmt.Errorf("SOME is not yet supported")
case tree.All:
return nil, fmt.Errorf("ALL is not yet supported")
default:
return nil, fmt.Errorf("unknown comparison operator used")
}
return &vitess.ComparisonExpr{
Operator: operator,
Left: left,
Right: right,
Escape: nil, //TODO: is '\' the default in Postgres as well?
}, nil
case *tree.DArray:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DBitArray:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DBool:
return vitess.InjectedExpr{
Expression: pgexprs.NewBoolLiteral(bool(*node)),
}, nil
case *tree.DBox2D:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DBytes:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DCollatedString:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DDate:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DDecimal:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DEnum:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DFloat:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DGeography:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DGeometry:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DIPAddr:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DInt:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DInterval:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DJSON:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DOid:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DOidWrapper:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DString:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DTime:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DTimeTZ:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DTimestamp:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DTimestampTZ:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DTuple:
return nil, fmt.Errorf("the statement is not yet supported")
case *tree.DUuid:
return nil, fmt.Errorf("the statement is not yet supported")
case tree.DefaultVal:
// TODO: can we use this?
defVal := &vitess.Default{ColName: ""}
return defVal, nil
case *tree.FuncExpr:
return nodeFuncExpr(node)
case *tree.IfErrExpr:
return nil, fmt.Errorf("IFERROR is not yet supported")
case *tree.IfExpr:
//TODO: probably should be the IF function
return nil, fmt.Errorf("IF is not yet supported")
case *tree.IndexedVar:
//TODO: figure out if I can delete this
return nil, fmt.Errorf("this should probably be deleted (internal error, IndexedVar)")
case *tree.IndirectionExpr:
return nil, fmt.Errorf("subscripts are not yet supported")
case *tree.IsNotNullExpr:
expr, err := nodeExpr(node.Expr)
if err != nil {
return nil, err
}
return &vitess.IsExpr{
Operator: vitess.IsNotNullStr,
Expr: expr,
}, nil
case *tree.IsNullExpr:
expr, err := nodeExpr(node.Expr)
if err != nil {
return nil, err
}
return &vitess.IsExpr{
Operator: vitess.IsNullStr,
Expr: expr,
}, nil
case *tree.IsOfTypeExpr:
return nil, fmt.Errorf("IS OF is not yet supported")
case *tree.NotExpr:
expr, err := nodeExpr(node.Expr)
if err != nil {
return nil, err
}
return &vitess.NotExpr{
Expr: expr,
}, nil
case *tree.NullIfExpr:
expr1, err := nodeExprToSelectExpr(node.Expr1)
if err != nil {
return nil, err
}
expr2, err := nodeExprToSelectExpr(node.Expr2)
if err != nil {
return nil, err
}
return &vitess.FuncExpr{
Name: vitess.NewColIdent("NULLIF"),
Exprs: vitess.SelectExprs{expr1, expr2},
}, nil
case tree.NullLiteral:
return &vitess.NullVal{}, nil
case *tree.NumVal:
switch node.Kind() {
case constant.Int:
intLiteral, err := pgexprs.NewIntegerLiteral(node.FormattedString())
return vitess.InjectedExpr{
Expression: intLiteral,
}, err
case constant.Float:
numericLiteral, err := pgexprs.NewNumericLiteral(node.FormattedString())
return vitess.InjectedExpr{
Expression: numericLiteral,
}, err
default:
return nil, fmt.Errorf("unknown number format")
}
case *tree.OrExpr:
left, err := nodeExpr(node.Left)
if err != nil {
return nil, err
}
right, err := nodeExpr(node.Right)
if err != nil {
return nil, err
}
return &vitess.OrExpr{
Left: left,
Right: right,
}, nil
case *tree.ParenExpr:
expr, err := nodeExpr(node.Expr)
if err != nil {
return nil, err
}
return &vitess.ParenExpr{
Expr: expr,
}, nil
case *tree.PartitionMaxVal:
return nil, fmt.Errorf("MAXVALUE is not yet supported")
case *tree.PartitionMinVal:
return nil, fmt.Errorf("MINVALUE is not yet supported")
case *tree.Placeholder:
// TODO: deal with type annotation
mysqlBindVarIdx := node.Idx + 1
return vitess.NewValArg([]byte(fmt.Sprintf(":v%d", mysqlBindVarIdx))), nil
case *tree.RangeCond:
operator := vitess.BetweenStr
if node.Not {
operator = vitess.NotBetweenStr
}
left, err := nodeExpr(node.Left)
if err != nil {
return nil, err
}
from, err := nodeExpr(node.From)
if err != nil {
return nil, err
}
to, err := nodeExpr(node.To)
if err != nil {
return nil, err
}
if node.Symmetric {
return &vitess.OrExpr{
Left: &vitess.RangeCond{
Operator: operator,
Left: left,
From: from,
To: to,
},
Right: &vitess.RangeCond{
Operator: operator,
Left: left,
From: to,
To: from,
},
}, nil
} else {
return &vitess.RangeCond{
Operator: operator,
Left: left,
From: from,
To: to,
}, nil
}
case *tree.StrVal:
//TODO: determine what to do when node.WasScannedAsBytes() is true
stringLiteral, err := pgexprs.NewStringLiteral(node.RawString())
return vitess.InjectedExpr{
Expression: stringLiteral,
}, err
case *tree.Subquery:
return nodeSubquery(node)
case *tree.Tuple:
if len(node.Labels) > 0 {
return nil, fmt.Errorf("tuple labels are not yet supported")
}
if node.Row {
return nil, fmt.Errorf("ROW keyword for tuples not yet supported")
}
valTuple, err := nodeExprs(node.Exprs)
if err != nil {
return nil, err
}
return vitess.ValTuple(valTuple), nil
case *tree.TupleStar:
return nil, fmt.Errorf("(E).* is not yet supported")
case *tree.UnaryExpr:
expr, err := nodeExpr(node.Expr)
if err != nil {
return nil, err
}
var operator framework.Operator
switch node.Operator {
//TODO: need to add UnaryPlus, it's like a no-op but Postgres actually implements it and it affects coercion
case tree.UnaryMinus:
operator = framework.Operator_UnaryMinus
case tree.UnaryComplement:
return &vitess.UnaryExpr{
Operator: vitess.TildaStr,
Expr: expr,
}, nil
case tree.UnarySqrt:
//TODO: replace with a function
return nil, fmt.Errorf("square root operator is not yet supported")
case tree.UnaryCbrt:
//TODO: replace with a function
return nil, fmt.Errorf("cube root operator is not yet supported")
case tree.UnaryAbsolute:
//TODO: replace with a function
return nil, fmt.Errorf("absolute operator is not yet supported")
default:
return nil, fmt.Errorf("the unary operator used is not yet supported")
}
return vitess.InjectedExpr{
Expression: pgexprs.NewUnaryOperator(operator),
Children: vitess.Exprs{expr},
}, nil
case tree.UnqualifiedStar:
return nil, fmt.Errorf("* syntax is not yet supported in this context")
case *tree.UnresolvedName:
if node.NumParts > 2 {
return nil, fmt.Errorf("referencing items outside the schema or database is not yet supported")
}
if node.Star {
return nil, fmt.Errorf("name resolution on this statement is not yet supported")
}
var tableName vitess.TableName
if node.NumParts == 2 {
tableName.Name = vitess.NewTableIdent(node.Parts[1])
}
return &vitess.ColName{
Name: vitess.NewColIdent(node.Parts[0]),
Qualifier: tableName,
}, nil
case nil:
return nil, nil
default:
return nil, fmt.Errorf("unknown expression: `%T`", node)
}
}
// translateConvertType translates the *vitess.ConvertType expression given to a new one, substituting type names as
// appropriate. An error is returned if the type named cannot be supported.
func translateConvertType(convertType *vitess.ConvertType) (*vitess.ConvertType, error) {
switch strings.ToLower(convertType.Type) {
// passthrough types that need no conversion
case expression.ConvertToBinary, expression.ConvertToChar, expression.ConvertToNChar, expression.ConvertToDate,
expression.ConvertToDatetime, expression.ConvertToFloat, expression.ConvertToDouble, expression.ConvertToJSON,
expression.ConvertToReal, expression.ConvertToSigned, expression.ConvertToTime, expression.ConvertToUnsigned:
return convertType, nil
case "text", "character varying", "varchar":
return &vitess.ConvertType{
Type: expression.ConvertToChar,
}, nil
case "integer", "bigint":
return &vitess.ConvertType{
Type: expression.ConvertToSigned,
}, nil
case "decimal", "numeric":
return &vitess.ConvertType{
Type: expression.ConvertToFloat,
}, nil
case "boolean":
return &vitess.ConvertType{
Type: expression.ConvertToSigned,
}, nil
case "timestamp", "timestamp with time zone", "timestamp without time zone":
return &vitess.ConvertType{
Type: expression.ConvertToDatetime,
}, nil
default:
return nil, fmt.Errorf("unknown convert type: `%T`", convertType.Type)
}
}