dhruv9vats commented on a change in pull request #12162:
URL: https://github.com/apache/arrow/pull/12162#discussion_r785449919
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File path: cpp/src/arrow/compute/kernels/scalar_nested.cc
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@@ -429,6 +430,97 @@ const FunctionDoc make_struct_doc{"Wrap Arrays into a
StructArray",
{"*args"},
"MakeStructOptions"};
+struct MapArrayLookupFunctor {
+ static Status ExecMapArray(KernelContext* ctx, const ExecBatch& batch,
Datum* out) {
+ const auto& options = OptionsWrapper<MapArrayLookupOptions>::Get(ctx);
+
+ MapArray map_array(batch[0].array());
+
+ // Offset differences will tell the number of Strcut = {key, value} pairs
+ // present in the current list.
+ // const std::shared_ptr<arrow::Buffer> offsets =
map_array.value_offsets();
+
+ std::shared_ptr<arrow::Array> keys = map_array.keys();
+ std::shared_ptr<arrow::Array> items = map_array.items();
+
+ const auto& query_key = options.query_key;
+ const auto& occurence = options.occurence;
+
+ std::unique_ptr<ArrayBuilder> builder;
Review comment:
Currently just outputting an `Array` of type same as the `item_type` in
the `MapArray`. With just one element for the `Occurence::First` option.
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