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_r384857792
##########
File path:
pinot-core/src/main/java/org/apache/pinot/core/segment/virtualcolumn/ColumnProviderFactory.java
##########
@@ -20,18 +20,29 @@
import
org.apache.pinot.common.utils.CommonConstants.Segment.BuiltInVirtualColumn;
import org.apache.pinot.common.utils.NetUtil;
+import org.apache.pinot.core.segment.index.column.ColumnContext;
+import org.apache.pinot.core.segment.index.column.ColumnProvider;
+import
org.apache.pinot.core.segment.index.column.DefaultNullValueColumnProvider;
import org.apache.pinot.spi.data.DimensionFieldSpec;
import org.apache.pinot.spi.data.FieldSpec;
import org.apache.pinot.spi.data.Schema;
/**
- * Factory for virtual column providers.
+ * Factory for column providers.
*/
-public class VirtualColumnProviderFactory {
- public static VirtualColumnProvider buildProvider(String
virtualColumnProvider) {
+public class ColumnProviderFactory {
+ public static ColumnProvider buildProvider(ColumnContext columnContext) {
+ String virtualColumnProvider =
columnContext.getFieldSpec().getVirtualColumnProvider();
try {
- return (VirtualColumnProvider)
Class.forName(virtualColumnProvider).newInstance();
+ // Use the preset virtualColumnProvider if available
+ if (virtualColumnProvider != null && !virtualColumnProvider
+ .equals(DefaultNullValueColumnProvider.class.getName())) {
+ return (ColumnProvider)
Class.forName(virtualColumnProvider).newInstance();
+ }
+ // Create the columnProvider that returns default null values based on
the columnContext
+ return
DefaultNullValueColumnProvider.class.getDeclaredConstructor(ColumnContext.class)
+ .newInstance(columnContext);
Review comment:
Should we be using PluginClassLoader here?
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