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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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.
//go:build go1.18
package compute
import (
"fmt"
"github.com/apache/arrow-go/v18/arrow"
"github.com/apache/arrow-go/v18/arrow/compute/exec"
"github.com/apache/arrow-go/v18/arrow/compute/internal/kernels"
)
var (
andDoc = FunctionDoc{
Summary: "Logical 'and' boolean values",
Description: "When a null is encountered in either input, a null is output.\nFor a different null behavior, see function 'and_kleene'",
ArgNames: []string{"x", "y"},
}
andNotDoc = FunctionDoc{
Summary: "Logical 'and not' boolean values",
Description: "When a null is encountered in either input, a null is output.\nFor a different null behavior, see function 'and_not_kleene'",
ArgNames: []string{"x", "y"},
}
orDoc = FunctionDoc{
Summary: "Logical 'or' boolean values",
Description: "When a null is encountered in either input, a null is output.\nFor a different null behavior, see function 'or_kleene'",
ArgNames: []string{"x", "y"},
}
xorDoc = FunctionDoc{
Summary: "Logical 'xor' boolean values",
Description: "When a null is encountered in either input, a null is output.",
ArgNames: []string{"x", "y"},
}
andKleeneDoc = FunctionDoc{
Summary: "Logical 'and' boolean values (Kleene logic)",
Description: `This function behaves as follows with nulls:
- true and null = null
- null and true = null
- false and null = false
- null and false = false
- null and null = null
In other words, in this context, a null value really means "unknown"
and an unknown value "and" false is always false.
For a different null behavior, see function "and".`,
ArgNames: []string{"x", "y"},
}
andNotKleeneDoc = FunctionDoc{
Summary: "Logical 'and_not' boolean values (Kleene logic)",
Description: `This function behaves as follows with nulls:
- true and not null = null
- null and not false = null
- false and not null = false
- null and not true = false
- null and not null = null
In other words, in this context, a null value really means "unknown"
and an unknown value "and not" true is always false, as is false
"and not" an unknown value.
For a different null behavior, see function "and_not".`,
ArgNames: []string{"x", "y"},
}
orKleeneDoc = FunctionDoc{
Summary: "Logical 'or' boolean values (Kleene logic)",
Description: `This function behaves as follows with nulls:
- true or null = true
- null or true = true
- false or null = null
- null or false = null
- null or null = null
In other words, in this context, a null value really means "unknown"
and an unknown value "or" true is always true.
For a different null behavior, see function "and".`,
ArgNames: []string{"x", "y"},
}
notDoc = FunctionDoc{
Summary: "Logical 'not' boolean values",
Description: "Negates the input boolean value",
ArgNames: []string{"x"},
}
)
func makeFunction(reg FunctionRegistry, name string, arity int, ex exec.ArrayKernelExec, doc FunctionDoc, nulls exec.NullHandling) {
fn := NewScalarFunction(name, Arity{NArgs: arity}, doc)
inTypes := make([]exec.InputType, arity)
for i := range inTypes {
inTypes[i] = exec.NewExactInput(arrow.FixedWidthTypes.Boolean)
}
k := exec.NewScalarKernel(inTypes, exec.NewOutputType(arrow.FixedWidthTypes.Boolean), ex, nil)
k.NullHandling = nulls
if err := fn.AddKernel(k); err != nil {
panic(err)
}
if !reg.AddFunction(fn, false) {
panic(fmt.Errorf("function '%s' already exists", name))
}
}
func RegisterScalarBoolean(reg FunctionRegistry) {
makeFunction(reg, "and", 2, kernels.SimpleBinary[kernels.AndOpKernel],
andDoc, exec.NullIntersection)
makeFunction(reg, "and_not", 2, kernels.SimpleBinary[kernels.AndNotOpKernel],
andNotDoc, exec.NullIntersection)
makeFunction(reg, "or", 2, kernels.SimpleBinary[kernels.OrOpKernel],
orDoc, exec.NullIntersection)
makeFunction(reg, "xor", 2, kernels.SimpleBinary[kernels.XorOpKernel],
xorDoc, exec.NullIntersection)
makeFunction(reg, "and_kleene", 2, kernels.SimpleBinary[kernels.KleeneAndOpKernel],
andKleeneDoc, exec.NullComputedPrealloc)
makeFunction(reg, "and_not_kleene", 2, kernels.SimpleBinary[kernels.KleeneAndNotOpKernel],
andNotKleeneDoc, exec.NullComputedPrealloc)
makeFunction(reg, "or_kleene", 2, kernels.SimpleBinary[kernels.KleeneOrOpKernel],
orKleeneDoc, exec.NullComputedPrealloc)
makeFunction(reg, "not", 1, kernels.NotExecKernel, notDoc,
exec.NullComputedNoPrealloc)
}
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