Jackie-Jiang commented on a change in pull request #4535: Implement DISTINCT
clause
URL: https://github.com/apache/incubator-pinot/pull/4535#discussion_r324930760
##########
File path:
pinot-common/src/main/java/org/apache/pinot/sql/parsers/CalciteSqlParser.java
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@@ -174,13 +185,24 @@ private static String removeOptionsFromSql(String sql) {
return matcher.replaceAll("");
}
+ private static List<Expression> convertDistinctSelectList(SqlNodeList
selectList) {
+ List<Expression> selectExpr = new ArrayList<>();
+ if (!Pql2Compiler.ENABLE_DISTINCT) {
+ throw new SqlCompilationException("Support for DISTINCT is currently
disabled in Pinot");
+ }
+
selectExpr.add(convertDistinctAndSelectListToFunctionExpression(selectList));
+ return selectExpr;
+ }
+
private static List<Expression> convertSelectList(SqlNodeList selectList) {
List<Expression> selectExpr = new ArrayList<>();
+
final Iterator<SqlNode> iterator = selectList.iterator();
while (iterator.hasNext()) {
final SqlNode next = iterator.next();
selectExpr.add(toExpression(next));
Review comment:
Not part of this PR, but we should deduplicate the columns
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