mcvsubbu commented on a change in pull request #4954: Support schema evolution
for consuming segments
URL: https://github.com/apache/incubator-pinot/pull/4954#discussion_r377987917
##########
File path:
pinot-core/src/main/java/org/apache/pinot/core/indexsegment/mutable/MutableSegmentImpl.java
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@@ -521,15 +550,38 @@ public SegmentMetadata getSegmentMetadata() {
return physicalColumnNames;
}
+ @Override
+ public Set<String> getColumnNamesForSelectStar() {
+ return Sets.union(getPhysicalColumnNames(),
_newlyAddedColumnsFieldMap.keySet());
+ }
+
@Override
public ColumnDataSource getDataSource(String columnName) {
FieldSpec fieldSpec = _schema.getFieldSpecFor(columnName);
- if (fieldSpec.isVirtualColumn()) {
+ if (fieldSpec == null || fieldSpec.isVirtualColumn()) {
+ // Column is either added during ingestion, or was initiated with a
virtual column provider
+ if (fieldSpec == null) {
+ // If the column was added during ingestion, we will construct the
virtual column provider based on its fieldSpec
+ fieldSpec = _newlyAddedColumnsFieldMap.get(columnName);
+ Preconditions.checkNotNull(fieldSpec, "FieldSpec for " + columnName +
" should not be null");
+ }
VirtualColumnContext virtualColumnContext = new
VirtualColumnContext(fieldSpec, _numDocsIndexed);
- VirtualColumnProvider virtualColumnProvider =
-
VirtualColumnProviderFactory.buildProvider(_schema.getFieldSpecFor(columnName).getVirtualColumnProvider());
- return new
ColumnDataSource(virtualColumnProvider.buildColumnIndexContainer(virtualColumnContext),
- virtualColumnProvider.buildMetadata(virtualColumnContext));
+
Review comment:
We need to do this only if the newly added column is a virtual column, right?
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