haibow commented on a change in pull request #4774: Refactor virtualColumn
URL: https://github.com/apache/incubator-pinot/pull/4774#discussion_r346089435
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File path:
pinot-core/src/main/java/org/apache/pinot/core/segment/virtualcolumn/SingleStringVirtualColumnProvider.java
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@@ -34,9 +33,11 @@
/**
* Virtual column provider for a virtual column that contains a single string.
*/
-public abstract class SingleStringVirtualColumnProvider extends
BaseVirtualColumnProvider {
+public class SingleStringVirtualColumnProvider extends
BaseVirtualColumnProvider {
- protected abstract String getValue(VirtualColumnContext context);
+ protected String getValue(VirtualColumnContext context) {
+ return context.getFieldSpec().getDefaultNullValue().toString();
Review comment:
Added a new class DefaultNullValueSingleStringVirtualColumnProvider
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