[
https://issues.apache.org/jira/browse/CALCITE-7523?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Yu Xu updated CALCITE-7523:
---------------------------
Description:
ClickHouse/Doris/StarRocks/Databend/BigQuery/Hive/Spark support * REPLACE(expr
as column);
we can refer
ClickHouse:[https://clickhouse.com/docs/zh/sql-reference/statements/select/replace-modifier]
The benefits of introducing this syntax are：
1. *Eliminates verbose column enumeration* — When a table has dozens of columns
and you only need to transform one or two, `REPLACE` lets you keep the wildcard
while overriding just the columns that matter, avoiding long, error-prone
select lists.
2. *Preserves schema stability* — Unlike manually listing columns, `REPLACE`
maintains the original column names and their positional order. Adding a new
column to the table later won't break the query.
3. *Complements `EXCLUDE` for full star-modification coverage* — With both
`EXCLUDE` (remove columns) and `REPLACE` (overwrite columns), Calcite now
supports the complete set of ClickHouse-style star modifiers, making the Babel
dialect more feature-complete.
4. *Reduces maintenance burden* — Queries like `SELECT * REPLACE(UPPER(name) AS
name)` are self-documenting and easier to maintain than repeating every column
name just to apply a single expression.
5. ClickHouse compatibility — This syntax is natively supported by ClickHouse,
so adding it improves interoperability for users migrating or federating
queries from that system.
was:
ClickHouse/Doris/StarRocks/Databend/BigQuery/Hive/Spark support * REPLACE(expr
as column);
we can refer
ClickHouse:[https://clickhouse.com/docs/zh/sql-reference/statements/select/replace-modifier]
The benefits of introducing this syntax are：
1. Eliminates verbose column enumeration — When a table has dozens of columns
and you only need to transform one or two, `REPLACE` lets you keep the wildcard
while overriding just the columns that matter, avoiding long, error-prone
select lists.
2. Preserves schema stability — Unlike manually listing columns, `REPLACE`
maintains the original column names and their positional order. Adding a new
column to the table later won't break the query.
3. Complements `EXCLUDE` for full star-modification coverage — With both
`EXCLUDE` (remove columns) and `REPLACE` (overwrite columns), Calcite now
supports the complete set of ClickHouse-style star modifiers, making the Babel
dialect more feature-complete.
4. Reduces maintenance burden — Queries like `SELECT * REPLACE(UPPER(name) AS
name)` are self-documenting and easier to maintain than repeating every column
name just to apply a single expression.
5. ClickHouse compatibility — This syntax is natively supported by ClickHouse,
so adding it improves interoperability for users migrating or federating
queries from that system.
> Support the syntax SELECT * REPLACE(expr as column)
> ---------------------------------------------------
>
> Key: CALCITE-7523
> URL: https://issues.apache.org/jira/browse/CALCITE-7523
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.41.0
> Reporter: Yu Xu
> Assignee: Yu Xu
> Priority: Minor
> Fix For: 1.42.0
>
>
> ClickHouse/Doris/StarRocks/Databend/BigQuery/Hive/Spark support *
> REPLACE(expr as column);
> we can refer
> ClickHouse:[https://clickhouse.com/docs/zh/sql-reference/statements/select/replace-modifier]
> The benefits of introducing this syntax are：
> 1. *Eliminates verbose column enumeration* — When a table has dozens of
> columns and you only need to transform one or two, `REPLACE` lets you keep
> the wildcard while overriding just the columns that matter, avoiding long,
> error-prone select lists.
> 2. *Preserves schema stability* — Unlike manually listing columns, `REPLACE`
> maintains the original column names and their positional order. Adding a new
> column to the table later won't break the query.
> 3. *Complements `EXCLUDE` for full star-modification coverage* — With both
> `EXCLUDE` (remove columns) and `REPLACE` (overwrite columns), Calcite now
> supports the complete set of ClickHouse-style star modifiers, making the
> Babel dialect more feature-complete.
> 4. *Reduces maintenance burden* — Queries like `SELECT * REPLACE(UPPER(name)
> AS name)` are self-documenting and easier to maintain than repeating every
> column name just to apply a single expression.
> 5. ClickHouse compatibility — This syntax is natively supported by
> ClickHouse, so adding it improves interoperability for users migrating or
> federating queries from that system.
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