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https://issues.apache.org/jira/browse/CALCITE-7110?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yu Xu closed CALCITE-7110.
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Resolution: Incomplete
> Invalid unparse for cast to nested type in PostgreSQL
> -----------------------------------------------------
>
> Key: CALCITE-7110
> URL: https://issues.apache.org/jira/browse/CALCITE-7110
> Project: Calcite
> Issue Type: Bug
> Reporter: Yu Xu
> Assignee: Yu Xu
> Priority: Major
> Labels: pull-request-available
>
> There 2 problem in PostgreSQL adapter.
> 1. TINYINT and DOUBLE can not work correctly in nested type such as
> ARRAY(from https://issues.apache.org/jira/browse/CALCITE-2305):
> {code:java}
> select cast(array[1,2,3] as TINYINT array) {code}
> shoud convert to:
> {code:java}
> SELECT CAST(ARRAY[1,2,3] AS SMALLINT ARRAY) {code}
> result is:
> array
> ---------------
> \{1, 2, 3}
> (1 row)
> but currently convert to：
> {code:java}
> SELECT CAST(ARRAY[1, 2, 3] AS TINYINT ARRAY) {code}
> this would error out：
> {code:java}
> psql:commands.sql:18: ERROR: type "tinyint[]" does not exist
> LINE 1: SELECT CAST(ARRAY[1, 2, 3] AS TINYINT ARRAY); {code}
> 2.The multi-layer nested ARRAY needs to be converted into a single layer
> ARRAY:
> such as:
> {code:java}
> select cast(array[array[1],array[2],array[3]] as int array array) {code}
> should convert to:
> {code:java}
> select cast(array[array[1],array[2],array[3]] as int array) {code}
> result is:
> {code:java}
> array
> ---------------
> {{1},{2},{3}}
> (1 row) {code}
> but currently convert to:
> {code:java}
> select cast(array[array[1],array[2],array[3]] as int array array) {code}
> which would error out:
> {code:java}
> psql:commands.sql:20: ERROR: syntax error at or near "array"
> LINE 1: ...(array[array[1],array[2],array[3]] as int array array); {code}
> additional PostgreSQL only support array and not support map/multiset types
> (https://www.postgresql.org/docs/current/datatype.html), the compatibility
> issues need to be fixed.
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