sunchao commented on a change in pull request #32753:
URL: https://github.com/apache/spark/pull/32753#discussion_r659191689
##########
File path:
sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/ParquetReadState.java
##########
@@ -33,31 +51,107 @@
/** The remaining number of values to read in the current batch */
int valuesToReadInBatch;
- ParquetReadState(int maxDefinitionLevel) {
+ ParquetReadState(int maxDefinitionLevel, PrimitiveIterator.OfLong
rowIndexes) {
this.maxDefinitionLevel = maxDefinitionLevel;
+ this.rowRanges = rowIndexes == null ? null : constructRanges(rowIndexes);
+ nextRange();
}
/**
- * Called at the beginning of reading a new batch.
+ * Construct a list of row ranges from the given `rowIndexes`. For example,
suppose the
+ * `rowIndexes` are `[0, 1, 2, 4, 5, 7, 8, 9]`, it will be converted into 3
row ranges:
+ * `[0-2], [4-5], [7-9]`.
*/
- void resetForBatch(int batchSize) {
+ private Iterator<RowRange> constructRanges(PrimitiveIterator.OfLong
rowIndexes) {
+ List<RowRange> rowRanges = new ArrayList<>();
+ long currentStart = Long.MIN_VALUE;
+ long previous = Long.MIN_VALUE;
+
+ while (rowIndexes.hasNext()) {
+ long idx = rowIndexes.nextLong();
+ if (previous == Long.MIN_VALUE) {
+ currentStart = previous = idx;
+ } else if (previous + 1 != idx) {
+ RowRange range = new RowRange(currentStart, previous);
+ rowRanges.add(range);
+ currentStart = previous = idx;
+ } else {
+ previous = idx;
+ }
Review comment:
Yeah good point. Will change.
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