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https://issues.apache.org/jira/browse/CALCITE-7081?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
xiong duan resolved CALCITE-7081.
---------------------------------
Resolution: Fixed
> Invalid unparse for cast to nested type in ClickHouse
> -----------------------------------------------------
>
> Key: CALCITE-7081
> URL: https://issues.apache.org/jira/browse/CALCITE-7081
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.40.0
> Reporter: Yu Xu
> Assignee: Yu Xu
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.41.0
>
>
> Sql in ClickHouse:
> {code:java}
> select cast(array['a','b','c'] as varchar array;{code}
> in ClickHouse would error:
> {code:java}
> Code: 62. DB::Exception: Syntax error: failed at position 258 ('(') (line 5,
> col 12): (array['a','b','c'] as varchar array;. Unmatched parentheses: (
> {code}
> should convert to:
> {code:java}
> SELECT CAST(array('a', 'b', 'c') AS Array(`String`));{code}
> result:
> {code:java}
> ['a','b','c'] {code}
> Map also can not convert right.
>
> sql:
> {code:java}
> select cast(array[MAP['a','1'],MAP['b','2'],MAP['c','3']] as
> MAP<varchar,varchar> array); {code}
> in ClickHouse would error:
> {code:java}
> Code: 62. DB::Exception: Syntax error: failed at position 383 (',') (line 9,
> col 26): ,'1'],MAP['b','2'],MAP['c','3']] as MAP<varchar,varchar> array); .
> Expected one of: DoubleColon, LIKE, GLOBAL NOT IN, end of query, AS, DIV, IS,
> OR, QuestionMark, BETWEEN, NOT LIKE, MOD, AND, alias, IN, ILIKE, NOT ILIKE,
> NOT, token, NOT IN, GLOBAL IN {code}
> should convert to:
> {code:java}
> SELECT CAST(array(map('a', '1'), map('b', '2'), map('c', '3')) AS
> Array(Map(`String`, `Nullable(String)`))) ;{code}
> result:
> {code:java}
> [{'a':'1'},{'b':'2'},{'c':'3'}] {code}
> we can find that in such like ClickHouse databasesystem, {*}Map/Array are
> c{*}{*}ase sensitive{*}，we
> need to write the words accurately.
> we can refer:
> [https://clickhouse.com/docs/sql-reference/data-types/array]
> https://clickhouse.com/docs/sql-reference/data-types/map
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