siddharthteotia commented on a change in pull request #7972:
URL: https://github.com/apache/pinot/pull/7972#discussion_r780712377
##########
File path:
pinot-common/src/main/java/org/apache/pinot/sql/parsers/CalciteSqlParser.java
##########
@@ -147,6 +147,9 @@ static void validate(PinotQuery pinotQuery)
private static void validateGroupByClause(PinotQuery pinotQuery)
throws SqlCompilationException {
if (pinotQuery.getGroupByList() == null) {
+ if (containsAggregateAndColsInSelectClause(pinotQuery)) {
+ throw new SqlCompilationException("Columns and Aggregate functions
can't co-exist without GROUP BY clause");
+ }
return;
}
// Sanity check group by query: All non-aggregate expression in selection
list should be also included in group
Review comment:
If possible, I would like to avoid additional pass over
`pinotQuery.getSelectList()`. How about we change code in lines 157 to 163 in
the following way to achieve this ?
```
boolean groupByListEmpty = pinotQuery.getGroupByList().isEmpty() ||
pinotQuery.getGroupByList() == null;
for (Expression selectExpression : pinotQuery.getSelectList()) {
if (isAggregateExpression(selectExpression)) {
aggregateExprCount++;
}
else if (!groupByListEmpty ) {
if (expressionOutsideGroupByList(selectExpression,
groupByExprs)) {
throw new SqlCompilationException(
"'" + RequestUtils.prettyPrint(selectExpression) + "'
should appear in GROUP BY clause.");
}
} else if (expressionContainsColumn(expr) && aggregateExprCount > 0) {
throw new SqlCompilationException(
"Non-aggregate and Aggregate expressions can't
co-exist without GROUP BY clause");
}
}
```
Let's also remove code between lines 149 and 152
Also I feel that we don't need to explicitly check
`expressionContainsColumn(expr)`. If the expression in the `selectList` is not
an aggregate expression, then it could either be a non-aggregate
literal/identifier/function expression. In any case, if the `aggregateExprCount
> 0`, we know there is a combination of non-aggregate and aggregate expression
together in the selectList without GROUP BY clause.
So the last else if condition can simply be `else if (aggregateExprCount >
0)`
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