sadikovi commented on a change in pull request #34611: URL: https://github.com/apache/spark/pull/34611#discussion_r754826874
########## File path: sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/VectorizedPlainValuesReader.java ########## @@ -53,19 +53,47 @@ public void skip() { throw new UnsupportedOperationException(); } + private void updateCurrentByte() { + try { + currentByte = (byte) in.read(); + } catch (IOException e) { + throw new ParquetDecodingException("Failed to read a byte", e); + } + } + @Override public final void readBooleans(int total, WritableColumnVector c, int rowId) { - // TODO: properly vectorize this - for (int i = 0; i < total; i++) { - c.putBoolean(rowId + i, readBoolean()); + int i = 0; + if (bitOffset > 0) { + i = Math.min(8 - bitOffset, total); + c.putBooleans(rowId, i, currentByte, bitOffset); + bitOffset = (bitOffset + i) & 7; + } + for (; i + 7 < total; i += 8) { + updateCurrentByte(); + c.putBooleans(rowId + i, currentByte); + } + if (i < total) { + updateCurrentByte(); + bitOffset = total - i; + c.putBooleans(rowId + i, bitOffset, currentByte, 0); } } @Override public final void skipBooleans(int total) { - // TODO: properly vectorize this - for (int i = 0; i < total; i++) { - readBoolean(); + // using >>3 instead of /8 below since Java division rounds towards zero i.e. (-1)/8=0 Review comment: My concern is that the testing coverage is low and we could introduce subtle bugs that could be difficult to debug. I guess it is fine to keep as is. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org