dongjoon-hyun commented on a change in pull request #23387:
[SPARK-26447][SQL]Allow OrcColumnarBatchReader to return less partition columns
URL: https://github.com/apache/spark/pull/23387#discussion_r244266136
##########
File path:
sql/core/src/main/java/org/apache/spark/sql/execution/datasources/orc/OrcColumnarBatchReader.java
##########
@@ -143,75 +147,75 @@ public void initialize(
/**
* Initialize columnar batch by setting required schema and partition
information.
* With this information, this creates ColumnarBatch with the full schema.
+ *
+ * @param orcSchema Schema from ORC file reader.
+ * @param requiredFields All the fields that are required to return,
including partition fields.
+ * @param requestedDataColIds Requested column ids from orcSchema. -1 if not
existed.
+ * @param requestedPartitionColIds Requested column ids from partition
schema. -1 if not existed.
+ * @param partitionValues Values of partition columns.
*/
public void initBatch(
TypeDescription orcSchema,
- int[] requestedColIds,
StructField[] requiredFields,
- StructType partitionSchema,
+ int[] requestedDataColIds,
+ int[] requestedPartitionColIds,
InternalRow partitionValues) {
batch = orcSchema.createRowBatch(capacity);
assert(!batch.selectedInUse); // `selectedInUse` should be initialized
with `false`.
-
+ assert(requiredFields.length == requestedDataColIds.length);
+ assert(requiredFields.length == requestedPartitionColIds.length);
+ // If a required column is also partition column, use partition value and
don't read from file.
+ for (int i = 0; i < requiredFields.length; i++) {
+ if (requestedPartitionColIds[i] != -1) {
+ requestedDataColIds[i] = -1;
+ }
+ }
Review comment:
Thanks.
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