Jackie-Jiang commented on a change in pull request #4535: Implement DISTINCT
clause
URL: https://github.com/apache/incubator-pinot/pull/4535#discussion_r319703822
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File path:
pinot-common/src/main/java/org/apache/pinot/pql/parsers/pql2/ast/FunctionCallAstNode.java
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@@ -75,22 +83,52 @@ public String getExpression() {
return _expression;
}
- public AggregationInfo buildAggregationInfo() {
+ AggregationInfo buildAggregationInfo() {
String expression;
// COUNT aggregation function always works on '*'
- if (_name.equalsIgnoreCase("count")) {
+ if (_name.equalsIgnoreCase(COUNT_FUNCTION_NAME)) {
expression = "*";
} else {
List<? extends AstNode> children = getChildren();
- if (children == null || children.size() != 1) {
- throw new Pql2CompilationException("Aggregation function expects exact
1 argument");
+ if (children == null || children.size() < 1) {
+ throw new Pql2CompilationException("Aggregation function expects
non-null argument");
+ }
+ if (!_name.equalsIgnoreCase(DISTINCT_FUNCTION_NAME)) {
+ if (children.size() != 1) {
+ throw new Pql2CompilationException("Aggregation function expects
exactly 1 argument as column name");
+ } else {
+ expression =
TransformExpressionTree.getStandardExpression(children.get(0));
+ }
+ } else {
+ // DISTINCT
+ if (!Pql2Compiler.ENABLE_DISTINCT) {
+ throw new Pql2CompilationException("Support for DISTINCT is
currently disabled");
+ }
+ if (children.size() == 1) {
Review comment:
Same comments as in `PinotQuery2BrokerRequestConverter`
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