Jackie-Jiang commented on code in PR #11307:
URL: https://github.com/apache/pinot/pull/11307#discussion_r1334896231
##########
pinot-broker/src/main/java/org/apache/pinot/broker/requesthandler/BaseBrokerRequestHandler.java:
##########
@@ -940,6 +954,23 @@ private static Set<String>
getSegmentPartitionedColumns(@Nullable TableConfig ta
return segmentPartitionedColumns;
}
+ /**
+ * Retrieve multivalued columns for a table.
+ * From the table Schema , we get the multi valued columns of dimension
fields.
+ *
+ * @param tableSchema
+ * @param columnName
+ * @return multivalued columns of the table .
+ */
+ private static boolean checkIfColumnIsMultiValued(@Nonnull Schema
tableSchema, @Nonnull String columnName) {
Review Comment:
(minor, convention) We don't usually annotate `Nonnull` and assume non-null
unless annotated with `Nullable`. We don't annotate both of them because it is
easy to mix them
```suggestion
private static boolean isMultiValueColumn(Schema schema, String
columnName) {
```
##########
pinot-broker/src/main/java/org/apache/pinot/broker/requesthandler/BaseBrokerRequestHandler.java:
##########
@@ -1073,6 +1104,50 @@ private static void
handleDistinctCountBitmapOverride(PinotQuery pinotQuery) {
}
}
+ /**
+ * Rewrites selected 'Distinct' prefixed function to 'Distinct----MV'
function for the field of multivalued type.
+ */
+ @VisibleForTesting
+ static void handleDistinctMultiValuedOverride(PinotQuery pinotQuery, Schema
tableSchema) {
+ for (Expression expression : pinotQuery.getSelectList()) {
+ handleDistinctMultiValuedOverride(expression, tableSchema);
+ }
+ List<Expression> orderByExpressions = pinotQuery.getOrderByList();
+ if (orderByExpressions != null) {
+ for (Expression expression : orderByExpressions) {
+ // NOTE: Order-by is always a Function with the ordering of the
Expression
+
handleDistinctMultiValuedOverride(expression.getFunctionCall().getOperands().get(0),
tableSchema);
+ }
+ }
+ Expression havingExpression = pinotQuery.getHavingExpression();
+ if (havingExpression != null) {
+ handleDistinctMultiValuedOverride(havingExpression, tableSchema);
+ }
+ }
+
+ /**
+ * Rewrites selected 'Distinct' prefixed function to 'Distinct----MV'
function for the field of multivalued type.
+ */
+ private static void handleDistinctMultiValuedOverride(Expression expression,
Schema tableSchema) {
+ Function function = expression.getFunctionCall();
+ if (function == null) {
+ return;
+ }
+ if
(DISTINCT_MV_COL_FUNCTION_OVERRIDE_MAP.containsKey(function.getOperator())) {
Review Comment:
To reduce a map lookup, we can use `get()` then check if the return value is
`null`
##########
pinot-broker/src/main/java/org/apache/pinot/broker/requesthandler/BaseBrokerRequestHandler.java:
##########
@@ -380,6 +389,11 @@ protected BrokerResponse handleRequest(long requestId,
String query, @Nullable S
handleDistinctCountBitmapOverride(serverPinotQuery);
}
+ final Schema tableSchema = _tableCache.getSchema(tableName);
Review Comment:
Move `Schema schema = _tableCache.getSchema(rawTableName);` from line 506
here
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