should be it

external/duckdb/extension/parquet/include/decoder/dictionary_decoder.hpp

@@ -0,0 +1,56 @@
+//===----------------------------------------------------------------------===//
+//                         DuckDB
+//
+// decoder/dictionary_decoder.hpp
+//
+//
+//===----------------------------------------------------------------------===//
+
+#pragma once
+
+#include "duckdb.hpp"
+#include "parquet_rle_bp_decoder.hpp"
+#include "resizable_buffer.hpp"
+
+namespace duckdb {
+class ColumnReader;
+struct TableFilterState;
+
+class DictionaryDecoder {
+public:
+	explicit DictionaryDecoder(ColumnReader &reader);
+
+public:
+	void InitializeDictionary(idx_t dictionary_size, optional_ptr<const TableFilter> filter,
+	                          optional_ptr<TableFilterState> filter_state, bool has_defines);
+	void InitializePage();
+	idx_t Read(uint8_t *defines, idx_t read_count, Vector &result, idx_t result_offset);
+	void Skip(uint8_t *defines, idx_t skip_count);
+	bool CanFilter(const TableFilter &filter, TableFilterState &filter_state);
+	bool DictionarySupportsFilter(const TableFilter &filter, TableFilterState &filter_state);
+	void Filter(uint8_t *defines, idx_t read_count, Vector &result, SelectionVector &sel, idx_t &approved_tuple_count);
+	bool HasFilter() const {
+		return filter_result.get();
+	}
+	bool HasFilteredOutAllValues() const {
+		return HasFilter() && filter_count == 0;
+	}
+
+private:
+	idx_t GetValidValues(uint8_t *defines, idx_t read_count, idx_t result_offset);
+	void ConvertDictToSelVec(uint32_t *offsets, const SelectionVector &rows, idx_t count);
+
+private:
+	ColumnReader &reader;
+	ResizeableBuffer &offset_buffer;
+	unique_ptr<RleBpDecoder> dict_decoder;
+	SelectionVector valid_sel;
+	SelectionVector dictionary_selection_vector;
+	idx_t dictionary_size;
+	buffer_ptr<VectorChildBuffer> dictionary;
+	unsafe_unique_array<bool> filter_result;
+	idx_t filter_count;
+	bool can_have_nulls;
+};
+
+} // namespace duckdb