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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "remove_trivial_dimension_optimizer.h"
#include "replace_type_function.h"
#include <vespa/eval/eval/value_type.h>
namespace vespalib::eval {
using namespace tensor_function;
namespace {
bool is_trivial_dim_list(const ValueType &type, const std::vector<vespalib::string> &dim_list) {
size_t npos = ValueType::Dimension::npos;
for (const vespalib::string &dim: dim_list) {
size_t idx = type.dimension_index(dim);
if ((idx == npos) || (type.dimensions()[idx].size != 1)) {
return false;
}
}
return true;
}
} // namespace vespalib::eval::<unnamed>
const TensorFunction &
RemoveTrivialDimensionOptimizer::optimize(const TensorFunction &expr, Stash &stash)
{
if (auto reduce = as<Reduce>(expr)) {
const TensorFunction &child = reduce->child();
if (expr.result_type().has_dimensions() &&
aggr::is_ident(reduce->aggr()) &&
is_trivial_dim_list(child.result_type(), reduce->dimensions()) &&
(expr.result_type().cell_type() == child.result_type().cell_type()))
{
return ReplaceTypeFunction::create_compact(expr.result_type(), child, stash);
}
}
return expr;
}
} // namespace vespalib::eval
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