walterddr commented on code in PR #9726:
URL: https://github.com/apache/pinot/pull/9726#discussion_r1015566450


##########
pinot-query-runtime/src/test/java/org/apache/pinot/query/runtime/operator/OperatorTestUtil.java:
##########
@@ -18,33 +18,43 @@
  */
 package org.apache.pinot.query.runtime.operator;
 
+import java.util.Arrays;
 import java.util.List;
-import org.apache.pinot.common.datablock.BaseDataBlock;
-import org.apache.pinot.common.datablock.DataBlockUtils;
 import org.apache.pinot.common.utils.DataSchema;
+import org.apache.pinot.core.operator.BaseOperator;
 import org.apache.pinot.query.runtime.blocks.TransferableBlock;
+import org.apache.pinot.query.testutils.MockDataBlockOperatorFactory;
 
 
 public class OperatorTestUtil {
-  private OperatorTestUtil() {
-  }
+  // simple key-value collision schema/data test set: "Aa" and "BB" have same 
hash code in java.
+  private static final List<List<Object[]>> SIMPLE_KV_DATA_ROWS = 
Arrays.asList(
+      Arrays.asList(new Object[]{1, "Aa"}, new Object[]{2, "BB"}, new 
Object[]{3, "BB"}),
+      Arrays.asList(new Object[]{1, "AA"}, new Object[]{2, "Aa"}));
+  private static final MockDataBlockOperatorFactory MOCK_OPERATOR_FACTORY;
 
-  public static final DataSchema TEST_DATA_SCHEMA = new DataSchema(new 
String[]{"foo", "bar"},
+  public static final DataSchema SIMPLE_KV_DATA_SCHEMA = new DataSchema(new 
String[]{"foo", "bar"},
       new DataSchema.ColumnDataType[]{DataSchema.ColumnDataType.INT, 
DataSchema.ColumnDataType.STRING});
 
-  public static TransferableBlock getEndOfStreamRowBlock() {
-    return getEndOfStreamRowBlockWithSchema();
+  public static final String OP_1 = "op1";
+  public static final String OP_2 = "op2";
+
+  static {
+    MOCK_OPERATOR_FACTORY = new MockDataBlockOperatorFactory()
+        .registerOperator(OP_1, SIMPLE_KV_DATA_SCHEMA)
+        .registerOperator(OP_2, SIMPLE_KV_DATA_SCHEMA)
+        .addRows(OP_1, SIMPLE_KV_DATA_ROWS.get(0))
+        .addRows(OP_2, SIMPLE_KV_DATA_ROWS.get(1));

Review Comment:
   FYI @61yao this would be how I envision ppl use this data block operator to 
add test data.
   
   also add multiple rows means return multiple data blocks (this would be 
super useful to test more complex cases)



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