xiong duan created CALCITE-6838:
-----------------------------------
Summary: ReloSqlConverter should generate double parentheses when
the input to Unnest is a query statement
Key: CALCITE-6838
URL: https://issues.apache.org/jira/browse/CALCITE-6838
Project: Calcite
Issue Type: Bug
Reporter: xiong duan
ReloSqlConverter should generate double parentheses when the input to Unnest is
a query statement.
For unit tests in RelToSqlConverterTest:
{code:java}
@Test void testUnnest() {
final String sql = "select * from UNNEST(array [1, 2, 3])";
final String expected = "SELECT *\n" +
"FROM UNNEST (SELECT ARRAY[1, 2, 3]\n" +
"FROM (VALUES (0)) AS \"t\" (\"ZERO\")) AS \"t0\" (\"col_0\")";
sql(sql).ok(expected).withPostgresql().ok(expected);
}{code}
The generated SQL is valid in CALCITE but not in PG.
In PostgreSQL:
{code:java}
CREATE TABLE IF NOT EXISTS public."unnestTable"
(
array_int integer[],
"valueInt" integer
);
SELECT "valueInt","t10"."col_0" FROM public."unnestTable",unnest(( SELECT
"array_int" FROM (VALUES (0)) AS "t" ("ZERO"))) AS "t10" ("col_0");
select * from unnest((SELECT "array_int" from public."unnestTable")) as "t"
("ZERO");
select * from unnest((SELECT ARRAY_AGG("valueInt") from public."unnestTable"))
as "t" ("ZERO");
select * from unnest((SELECT ARRAY_AGG("valueInt") from public."unnestTable"))
WITH ORDINALITY AS "t" ("ZERO","ZERO1");{code}
PG always need double parentheses.
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