Github user paul-rogers commented on a diff in the pull request: https://github.com/apache/drill/pull/611#discussion_r86587743 --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/columnreaders/VarLenBinaryReader.java --- @@ -43,43 +51,153 @@ public VarLenBinaryReader(ParquetRecordReader parentReader, List<VarLengthColumn public long readFields(long recordsToReadInThisPass, ColumnReader<?> firstColumnStatus) throws IOException { long recordsReadInCurrentPass = 0; - int lengthVarFieldsInCurrentRecord; - long totalVariableLengthData = 0; - boolean exitLengthDeterminingLoop = false; + // write the first 0 offset for (VarLengthColumn<?> columnReader : columns) { columnReader.reset(); } + //if(useAsyncTasks){ + // recordsReadInCurrentPass = determineSizesParallel(recordsToReadInThisPass); + //} else { + recordsReadInCurrentPass = determineSizesSerial(recordsToReadInThisPass); + //} + if(useAsyncTasks){ + readRecordsParallel(recordsReadInCurrentPass); + }else{ + readRecordsSerial(recordsReadInCurrentPass); + } + return recordsReadInCurrentPass; + } + + + private long determineSizesSerial(long recordsToReadInThisPass) throws IOException { + int lengthVarFieldsInCurrentRecord = 0; + boolean exitLengthDeterminingLoop = false; + long totalVariableLengthData = 0; + long recordsReadInCurrentPass = 0; do { - lengthVarFieldsInCurrentRecord = 0; for (VarLengthColumn<?> columnReader : columns) { - if ( !exitLengthDeterminingLoop ) { - exitLengthDeterminingLoop = columnReader.determineSize(recordsReadInCurrentPass, lengthVarFieldsInCurrentRecord); + if (!exitLengthDeterminingLoop) { + exitLengthDeterminingLoop = + columnReader.determineSize(recordsReadInCurrentPass, lengthVarFieldsInCurrentRecord); } else { break; } } // check that the next record will fit in the batch - if (exitLengthDeterminingLoop || (recordsReadInCurrentPass + 1) * parentReader.getBitWidthAllFixedFields() + totalVariableLengthData - + lengthVarFieldsInCurrentRecord > parentReader.getBatchSize()) { + if (exitLengthDeterminingLoop || + (recordsReadInCurrentPass + 1) * parentReader.getBitWidthAllFixedFields() + + totalVariableLengthData + lengthVarFieldsInCurrentRecord > parentReader.getBatchSize()) { + break; + } + for (VarLengthColumn<?> columnReader : columns) { + columnReader.updateReadyToReadPosition(); + columnReader.currDefLevel = -1; + } + recordsReadInCurrentPass++; + totalVariableLengthData += lengthVarFieldsInCurrentRecord; + } while (recordsReadInCurrentPass < recordsToReadInThisPass); + + return recordsReadInCurrentPass; + } + + + public long determineSizesParallel(long recordsToReadInThisPass ) throws IOException { + boolean doneReading = false; + int lengthVarFieldsInCurrentRecord = 0; + boolean exitLengthDeterminingLoop = false; + long totalVariableLengthData = 0; + long recordsReadInCurrentPass = 0; + + do { + doneReading = readPagesParallel(); + + if (!doneReading) { --- End diff -- Can't this be made simpler? ``` if ( ! readPagesParallel( ) ) { break; } ``` As far as I can tell, if doneReading is false, we'll skip the body of the loop (via another assignment later). A bit hard to follow...
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