Github user ppadma commented on a diff in the pull request: https://github.com/apache/drill/pull/749#discussion_r102830312 --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/columnreaders/VarLenBinaryReader.java --- @@ -33,35 +33,52 @@ ParquetRecordReader parentReader; final List<VarLengthColumn<? extends ValueVector>> columns; final boolean useAsyncTasks; + private final long targetRecordCount; public VarLenBinaryReader(ParquetRecordReader parentReader, List<VarLengthColumn<? extends ValueVector>> columns) { this.parentReader = parentReader; this.columns = columns; useAsyncTasks = parentReader.useAsyncColReader; + + // Can't read any more records than fixed width fields will fit. + // Note: this calculation is very likely wrong; it is a simplified + // version of earlier code, but probably needs even more attention. + + int totalFixedFieldWidth = parentReader.getBitWidthAllFixedFields() / 8; + if (totalFixedFieldWidth == 0) { + targetRecordCount = 0; + } else { + targetRecordCount = parentReader.getBatchSize() / totalFixedFieldWidth; + } } /** * Reads as many variable length values as possible. * * @param recordsToReadInThisPass - the number of records recommended for reading form the reader - * @param firstColumnStatus - a reference to the first column status in the parquet file to grab metatdata from + * @param firstColumnStatus - a reference to the first column status in the Parquet file to grab metatdata from * @return - the number of fixed length fields that will fit in the batch * @throws IOException */ public long readFields(long recordsToReadInThisPass, ColumnReader<?> firstColumnStatus) throws IOException { - long recordsReadInCurrentPass = 0; - // write the first 0 offset for (VarLengthColumn<?> columnReader : columns) { columnReader.reset(); } Stopwatch timer = Stopwatch.createStarted(); - recordsReadInCurrentPass = determineSizesSerial(recordsToReadInThisPass); - if(useAsyncTasks){ + long recordsReadInCurrentPass = determineSizesSerial(recordsToReadInThisPass); + + // Can't read any more records than fixed width fields will fit. + + if (targetRecordCount > 0) { + recordsToReadInThisPass = Math.min(recordsToReadInThisPass, targetRecordCount); --- End diff -- I think you mean to update recordsReadInCurrentPass. recordsToReadInThisPass is not being used after this. So, what is the point in updating ?
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