Xurenhe created CALCITE-5163:
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Summary: MysqlSqlDialect unparse LISTAGG aggregate function error
Key: CALCITE-5163
URL: https://issues.apache.org/jira/browse/CALCITE-5163
Project: Calcite
Issue Type: Bug
Components: core
Reporter: Xurenhe
Assignee: Xurenhe
CALCITE-4349 supports GROUP_CONCAT aggregate function. [The
code|https://github.com/apache/calcite/blob/7c1e2746b94a50f0bb08571287acb5327fdc1b16/core/src/main/java/org/apache/calcite/sql2rel/SqlToRelConverter.java#L5746]
translated *GROUP_CONCAT* to *LISTAGG* during sql_to_rel.
But, *MysqlSqlDialect* keep *LISTAGG* after uparsing query's relnode, the
result sql couldn't be executed in MySQL engine.
I expect the following test case to be successful, but it's failed.
{code:java}
// test in org.apache.calcite.rel.rel2sql.RelToSqlConverterTest
@Test void testMySqlGroupConcat() {
final String query = "select\n"
+ "listagg(distinct \"product_name\", ',') within group(order by
\"cases_per_pallet\")"
+ "from \"product\"\n"
+ "group by \"product_id\"\n";
final String expected = "SELECT GROUP_CONCAT(DISTINCT `product_name` ORDER BY
"
+ "`cases_per_pallet` IS NULL, `cases_per_pallet` SEPARATOR ',')\n"
+ "FROM `foodmart`.`product`\n"
+ "GROUP BY `product_id`";
sql(query).withMysql().ok(expected);
}{code}
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