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https://issues.apache.org/jira/browse/CALCITE-6838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17927330#comment-17927330
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xiong duan commented on CALCITE-6838:
-------------------------------------
The exception in BigQuery is clear:
{code:java}
The argument to UNNEST is an expression, not a query; to use a query as an
expression, the query must be wrapped with additional parentheses to make it a
scalar subquery expression at [9:19] {code}
The SQL(exception):
{code:java}
WITH Sequences AS ( SELECT 1 AS id, [0, 1, 1, 2, 3, 5] AS some_numbers
UNION ALL SELECT 2 AS id, [2, 4, 8, 16, 32] AS some_numbers UNION ALL SELECT
3 AS id, [5, 10] AS some_numbers )
SELECT id, flattened_numbersFROM SequencesINNER JOIN UNNEST(select
Sequences.some_numbers) AS flattened_numbers; {code}
The SQL(success):
{code:java}
WITH Sequences AS ( SELECT 1 AS id, [0, 1, 1, 2, 3, 5] AS some_numbers UNION
ALL SELECT 2 AS id, [2, 4, 8, 16, 32] AS some_numbers UNION ALL SELECT 3 AS id,
[5, 10] AS some_numbers )
SELECT id, flattened_numbersFROM SequencesINNER JOIN UNNEST((select
Sequences.some_numbers)) AS flattened_numbers; {code}
> 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
> Assignee: xiong duan
> Priority: Major
>
> 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}
> The PG always needs double parentheses.
> The Calcite supports double parentheses too.
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