pitrou commented on a change in pull request #8177:
URL: https://github.com/apache/arrow/pull/8177#discussion_r488812521
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File path: cpp/src/parquet/level_conversion.h
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@@ -132,44 +135,65 @@ struct PARQUET_EXPORT LevelInfo {
}
};
-void PARQUET_EXPORT DefinitionLevelsToBitmap(
- const int16_t* def_levels, int64_t num_def_levels, const int16_t
max_definition_level,
- const int16_t max_repetition_level, int64_t* values_read, int64_t*
null_count,
- uint8_t* valid_bits, int64_t valid_bits_offset);
-
-// These APIs are likely to be revised as part of ARROW-8494 to reduce
duplicate code.
-// They currently represent minimal functionality for vectorized computation
of definition
-// levels.
-
-#if defined(ARROW_LITTLE_ENDIAN)
-/// Builds a bitmap by applying predicate to the level vector provided.
-///
-/// \param[in] levels Rep or def level array.
-/// \param[in] num_levels The number of levels to process (must be [0, 64])
-/// \param[in] predicate The predicate to apply (must have the signature `bool
-/// predicate(int16_t)`.
-/// \returns The bitmap using least significant "bit" ordering.
-///
-/// N.B. Correct byte ordering is dependent on little-endian architectures.
-///
-template <typename Predicate>
-uint64_t LevelsToBitmap(const int16_t* levels, int64_t num_levels, Predicate
predicate) {
- // Both clang and GCC can vectorize this automatically with SSE4/AVX2.
- uint64_t mask = 0;
- for (int x = 0; x < num_levels; x++) {
- mask |= static_cast<uint64_t>(predicate(levels[x]) ? 1 : 0) << x;
- }
- return mask;
-}
-
-/// Builds a bitmap where each set bit indicates the corresponding level is
greater
-/// than rhs.
-static inline uint64_t GreaterThanBitmap(const int16_t* levels, int64_t
num_levels,
- int16_t rhs) {
- return LevelsToBitmap(levels, num_levels, [rhs](int16_t value) { return
value > rhs; });
-}
+// Input/Output structure for reconstructed validity bitmaps.
+struct PARQUET_EXPORT ValidityBitmapInputOutput {
+ // Input only.
+ // The maximum number of values_read expected (actual
+ // values read must be less than or equal to this value.
+ // If this number is exceeded methods will throw a
+ // ParquetException. Exceeding this limit indicates
+ // either a corrupt or incorrectly written file.
+ int64_t values_read_upper_bound = 0;
+ // Output only. The number of values added to the encountered
+ // (this is logicallyt he count of the number of elements
+ // for an Arrow array).
+ int64_t values_read = 0;
+ // Input/Output. The number of nulls encountered.
+ int64_t null_count = 0;
+ // Output only. The validity bitmap to populate. May be be null only
+ // for DefRepLevelsToListInfo (if all that is needed is list offsets).
+ uint8_t* valid_bits = NULLPTR;
+ // Input only, offset into valid_bits to start at.
+ int64_t valid_bits_offset = 0;
+};
-#endif
+// Converts def_levels to validity bitmaps for non-list arrays and structs
that have
+// at least one member that is not a list and has no list descendents.
+// For lists use DefRepLevelsToList and structs where all descendants contain
+// a list use DefRepLevelsToBitmap.
Review comment:
Fun :-)
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