cloud-fan commented on a change in pull request #32753:
URL: https://github.com/apache/spark/pull/32753#discussion_r659964485
##########
File path:
sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/ParquetReadState.java
##########
@@ -33,31 +51,104 @@
/** 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:
Review comment:
interesting, does the parquet reader lib give you a big array containing
these indexes, or it uses an algorithm to generate the indexes on the fly?
##########
File path:
sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/ParquetReadState.java
##########
@@ -33,31 +51,104 @@
/** 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:
Review comment:
And how fast/slow the parquet reader lib can generate the indexes?
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