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Merge pull request #390 from dolthub/daylon/comparisons
Added comparison operators
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| // Copyright 2024 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 expression | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
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| "github.com/dolthub/go-mysql-server/sql" | ||
| "github.com/dolthub/go-mysql-server/sql/expression" | ||
| vitess "github.com/dolthub/vitess/go/vt/sqlparser" | ||
|
|
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| pgtypes "github.com/dolthub/doltgresql/server/types" | ||
| ) | ||
|
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| // Not represents a NOT expression. | ||
| type Not struct { | ||
| child sql.Expression | ||
| } | ||
|
|
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| var _ vitess.Injectable = (*BinaryOperator)(nil) | ||
| var _ sql.Expression = (*BinaryOperator)(nil) | ||
| var _ expression.BinaryExpression = (*BinaryOperator)(nil) | ||
|
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| // NewNot returns a new *Not. | ||
| func NewNot() *Not { | ||
| return &Not{ | ||
| child: nil, | ||
| } | ||
| } | ||
|
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| // Children implements the sql.Expression interface. | ||
| func (n *Not) Children() []sql.Expression { | ||
| return []sql.Expression{n.child} | ||
| } | ||
|
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| // Eval implements the sql.Expression interface. | ||
| func (n *Not) Eval(ctx *sql.Context, row sql.Row) (any, error) { | ||
| val, err := n.child.Eval(ctx, row) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if val == nil { | ||
| return nil, nil | ||
| } | ||
| boolVal, ok := val.(bool) | ||
| if !ok { | ||
| return nil, fmt.Errorf("NOT only applies to boolean values") | ||
| } | ||
| return !boolVal, nil | ||
| } | ||
|
|
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| // IsNullable implements the sql.Expression interface. | ||
| func (n *Not) IsNullable() bool { | ||
| return true | ||
| } | ||
|
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| // Resolved implements the sql.Expression interface. | ||
| func (n *Not) Resolved() bool { | ||
| return n.child != nil && n.child.Resolved() | ||
| } | ||
|
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| // String implements the sql.Expression interface. | ||
| func (n *Not) String() string { | ||
| if n.child == nil { | ||
| return "NOT ?" | ||
| } | ||
| return "NOT " + n.child.String() | ||
| } | ||
|
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| // Type implements the sql.Expression interface. | ||
| func (n *Not) Type() sql.Type { | ||
| return pgtypes.Bool | ||
| } | ||
|
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| // WithChildren implements the sql.Expression interface. | ||
| func (n *Not) WithChildren(children ...sql.Expression) (sql.Expression, error) { | ||
| if len(children) != 1 { | ||
| return nil, sql.ErrInvalidChildrenNumber.New(n, len(children), 1) | ||
| } | ||
| return &Not{ | ||
| child: children[0], | ||
| }, nil | ||
| } | ||
|
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| // WithResolvedChildren implements the vitess.InjectableExpression interface. | ||
| func (n *Not) WithResolvedChildren(children []any) (any, error) { | ||
| if len(children) != 1 { | ||
| return nil, fmt.Errorf("invalid vitess child count, expected `1` but got `%d`", len(children)) | ||
| } | ||
| child, ok := children[0].(sql.Expression) | ||
| if !ok { | ||
| return nil, fmt.Errorf("expected vitess child to be an expression but has type `%T`", children[0]) | ||
| } | ||
| return &Not{ | ||
| child: child, | ||
| }, nil | ||
| } |
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