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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/eval/eval/tensor_function.h>
namespace vespalib::eval {
/**
* Look up the result of an expression (double->int64_t->label_enum)
* in a sparse tensor with a single dimension, resulting in a double
* result. If lookup keys are kept small [0,10000000> (to avoid label
* enumeration) this is a simple hashtable lookup with numeric keys.
**/
class SparseSingledimLookup : public tensor_function::Op2
{
public:
SparseSingledimLookup(const TensorFunction &tensor, const TensorFunction &expr);
InterpretedFunction::Instruction compile_self(const CTFContext &ctx) const override;
bool result_is_mutable() const override { return true; }
static const TensorFunction &optimize(const TensorFunction &expr, Stash &stash);
};
} // namespace
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