Jackie-Jiang commented on code in PR #8917:
URL: https://github.com/apache/pinot/pull/8917#discussion_r903149184
##########
pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/index/reader/ForwardIndexReader.java:
##########
@@ -410,9 +411,318 @@ default byte[] getBytes(int docId, T context) {
/**
* MULTI-VALUE COLUMN RAW INDEX APIs
- * TODO: Not supported yet
*/
+ /**
+ * Fills the values
+ * @param docIds Array containing the document ids to read
+ * @param length Number of values to read
+ * @param maxNumValuesPerMVEntry maximum number of values per MV entry
+ * @param values Values to fill
+ * @param context Reader context
+ */
+ default void readValuesMV(int[] docIds, int length, int
maxNumValuesPerMVEntry, int[][] values, T context) {
+ switch (getStoredType()) {
+ case INT:
+ int[] intValueBuffer = new int[maxNumValuesPerMVEntry];
+ for (int i = 0; i < length; i++) {
+ int numValues = getIntMV(docIds[i], intValueBuffer, context);
Review Comment:
For MV read, let's add APIs to directly read the values without passing in a
buffer, e.g. `int[] getIntMV(int docId, T context)`. This API will be very
useful to prevent unnecessary copying of the array, or when the
`maxNumValuesPerMVEntry` is not available
##########
pinot-core/src/main/java/org/apache/pinot/core/common/DataFetcher.java:
##########
@@ -713,8 +730,51 @@ void readStringValuesMV(TransformEvaluator evaluator,
int[] docIds, int length,
public void readNumValuesMV(int[] docIds, int length, int[]
numValuesBuffer) {
Tracing.activeRecording().setInputDataType(_dataType, _singleValue);
- for (int i = 0; i < length; i++) {
- numValuesBuffer[i] = _reader.getDictIdMV(docIds[i],
_reusableMVDictIds, getReaderContext());
+ if (_dictionary != null) {
+ for (int i = 0; i < length; i++) {
+ numValuesBuffer[i] = _reader.getDictIdMV(docIds[i],
_reusableMVDictIds, getReaderContext());
+ }
+ } else {
+ switch (_reader.getStoredType()) {
+ case INT:
+ int[] intValueBuffer = new int[_maxNumValuesPerMVEntry];
+ for (int i = 0; i < length; i++) {
+ numValuesBuffer[i] = _reader.getIntMV(docIds[i], intValueBuffer,
getReaderContext());
Review Comment:
This is adding lots of overhead because we don't really need to read the
values. Let's add an API `int getNumValuesMV(int docId, T context)` to the
`ForwardIndexReader` which simply returns the values in the MV entry without
reading any content
##########
pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/index/reader/ForwardIndexReader.java:
##########
@@ -47,7 +48,7 @@
* Returns the data type of the values in the forward index. Returns {@link
DataType#INT} for dictionary-encoded
* forward index.
*/
- DataType getValueType();
+ DataType getStoredType();
Review Comment:
Can we put this change as a separate PR?
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