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https://issues.apache.org/jira/browse/CALCITE-6909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17938323#comment-17938323
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Julian Hyde commented on CALCITE-6909:
--------------------------------------
Sorry to be pedantic, but which component would you be changing here? The
Clickhouse dialect (incoming), the Clickhouse dialect (outgoing, i.e. the JDBC
adapter), the type system?
Can you include in the description a use case, something the user would like to
do (e.g. run a SQL query) but cannot?
I don't plan to look at the PR until this case has a good summary and
description.
> Support ClickHouse Dailect with more precise Decimal type
> ---------------------------------------------------------
>
> Key: CALCITE-6909
> URL: https://issues.apache.org/jira/browse/CALCITE-6909
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.39.0
> Reporter: Yu Xu
> Assignee: Yu Xu
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.40.0
>
>
> Currently Calcite not support Decimal type in ClickHouse dialect.
> In ClickHouse:
> * *P - precision. Valid range: [ 1 : 76 ].*
> * *S - scale. Valid range: [ 0 : P ].*
> Depending on P parameter value Decimal(P, S) is a synonym for:
> * *P from [ 1 : 9 ] - for Decimal32(S)*
> * *P from [ 10 : 18 ] - for Decimal64(S)*
> * *P from [ 19 : 38 ] - for Decimal128(S)*
> * *P from [ 39 : 76 ] - for Decimal256(S)*
>
> we can refer to doc with:
> [https://clickhouse.com/docs/sql-reference/data-types/decimal]
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