ARROW-17475: [Go] Function interface and Registry impl #13924
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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. | ||
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| // Package compute is a native-go implementation of an Acero-like | ||
| // arrow compute engine. | ||
| // | ||
| // While consumers of Arrow that are able to use CGO could utilize the | ||
| // C Data API (using the cdata package) and could link against the | ||
| // acero library directly, there are consumers who cannot use CGO. This | ||
| // is an attempt to provide for those users, and in general create a | ||
| // native-go arrow compute engine. | ||
| // | ||
| // Everything in this package should be considered Experimental for now. | ||
| package compute | ||
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| //go:generate stringer -type=FuncKind -linecomment | ||
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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. | ||
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| package compute | ||
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| import ( | ||
| "context" | ||
| ) | ||
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| type Function interface { | ||
| Name() string | ||
| Kind() FuncKind | ||
| Arity() Arity | ||
| Doc() FunctionDoc | ||
| NumKernels() int | ||
|
There was a problem hiding this comment. Is it worth exposing this without also having a public concept of Kernels? There was a problem hiding this comment. I have a setup concept for Kernels, just haven't placed the interface in here yet (for the sake of keeping the size of this PR down) but they will almost certainly make into the 10.0.0 release so I'm okay with leaving this. |
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| Execute(context.Context, FunctionOptions, ...Datum) (Datum, error) | ||
| DefaultOptions() FunctionOptions | ||
| Validate() error | ||
| } | ||
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| type Arity struct { | ||
| NArgs int | ||
| IsVarArgs bool | ||
| } | ||
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| func Nullary() Arity { return Arity{0, false} } | ||
| func Unary() Arity { return Arity{1, false} } | ||
| func Binary() Arity { return Arity{2, false} } | ||
| func Ternary() Arity { return Arity{3, false} } | ||
| func VarArgs(minArgs int) Arity { return Arity{minArgs, true} } | ||
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| type FunctionDoc struct { | ||
| Summary string | ||
| Description string | ||
| ArgNames []string | ||
| OptionsClass string | ||
| OptionsRequired bool | ||
| } | ||
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| var EmptyFuncDoc FunctionDoc | ||
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| type FuncKind int8 | ||
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| const ( | ||
| FuncScalar FuncKind = iota // Scalar | ||
| FuncVector // Vector | ||
| FuncScalarAgg // ScalarAggregate | ||
| FuncHashAgg // HashAggregate | ||
| FuncMeta // Meta | ||
| ) | ||
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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. | ||
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| package compute_test | ||
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| import ( | ||
| "testing" | ||
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| "github.com/apache/arrow/go/v10/arrow/compute" | ||
| "github.com/stretchr/testify/assert" | ||
| ) | ||
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| func TestArityBasics(t *testing.T) { | ||
| nullary := compute.Nullary() | ||
| assert.Equal(t, 0, nullary.NArgs) | ||
| assert.False(t, nullary.IsVarArgs) | ||
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| unary := compute.Unary() | ||
| assert.Equal(t, 1, unary.NArgs) | ||
| assert.False(t, unary.IsVarArgs) | ||
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| binary := compute.Binary() | ||
| assert.Equal(t, 2, binary.NArgs) | ||
| assert.False(t, binary.IsVarArgs) | ||
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| ternary := compute.Ternary() | ||
| assert.Equal(t, 3, ternary.NArgs) | ||
| assert.False(t, ternary.IsVarArgs) | ||
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| varargs := compute.VarArgs(2) | ||
| assert.Equal(t, 2, varargs.NArgs) | ||
| assert.True(t, varargs.IsVarArgs) | ||
| } |
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Ah, so not just arrow::compute, but Acero itself is the goal.
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That's the goal yup. But it's a lofty goal. The first milestone is just simple scalar function execution...