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69 lines
2.4 KiB
Go
69 lines
2.4 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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 queryutil
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import (
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"context"
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"go.opentelemetry.io/otel/trace"
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)
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// Well-known operator names used in pipeline construction.
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const (
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OpReduceByPK = "reduce_by_pk"
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OpReduceByPKTS = "reduce_by_pk_ts"
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OpReduceByGroups = "reduce_by_groups"
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OpMergeByPKOffsets = "merge_by_pk_offsets"
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OpDeduplicatePK = "deduplicate_pk"
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OpConcatAndCheckPK = "concat_and_check_pk"
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OpOrderByLimit = "orderby_limit"
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OpSlice = "slice"
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OpRemap = "remap"
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OpFetchFields = "fetch_fields"
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)
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// Operator is the interface for query pipeline operators.
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// Each operator carries its own parameters and is self-contained.
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// Operators can be used at any level: proxy, delegator, or querynode worker.
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type Operator interface {
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// Run executes the operator with the given inputs.
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// Inputs and outputs are type-erased to allow flexible composition.
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Run(ctx context.Context, span trace.Span, inputs ...any) ([]any, error)
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// Name returns the operator name for logging/debugging.
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Name() string
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}
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// LambdaOperator wraps a function as an operator for inline transformations.
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type LambdaOperator struct {
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name string
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fn func(ctx context.Context, span trace.Span, inputs ...any) ([]any, error)
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}
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// NewLambdaOperator creates an operator from a function.
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func NewLambdaOperator(name string, fn func(ctx context.Context, span trace.Span, inputs ...any) ([]any, error)) *LambdaOperator {
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return &LambdaOperator{name: name, fn: fn}
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}
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func (op *LambdaOperator) Run(ctx context.Context, span trace.Span, inputs ...any) ([]any, error) {
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return op.fn(ctx, span, inputs...)
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}
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func (op *LambdaOperator) Name() string {
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return op.name
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}
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