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https://issues.apache.org/jira/browse/HIVE-4821?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Hanson updated HIVE-4821:
------------------------------
Description:
Implement vectorized support for casting from any type to any type.
>From the documentation:
cast(expr as <type>): Converts the results of the expression expr to <type>
e.g. cast('1' as BIGINT) will convert the string '1' to it integral
representation. A null is returned if the conversion does not succeed
The current supported internal types are:
LONG
DOUBLE
STRING
TIMESTAMP
Before implementation, determine what are the semantics of explicit casting to
types less general than the internal types. E.g. what if you cast DOUBLE to
TINYINT? Can we just cast internally to LONG and let the output process cast to
TINYINT?
This JIRA includes all work to make casting operate end-to-end in a SQL query
in vectorized mode, including updates to VectorizationContext.
was:
Implement vectorized support for casting from any type to any type.
>From the documentation:
cast(expr as <type>): Converts the results of the expression expr to <type>
e.g. cast('1' as BIGINT) will convert the string '1' to it integral
representation. A null is returned if the conversion does not succeed
The current supported internal types are:
LONG
DOUBLE
STRING
TIMESTAMP
Before implementation, determine what are the semantics of explicit casting to
types less general than the internal types. E.g. what if you cast DOUBLE to
TINYINT? Can we just cast internally to LONG and let the output process cast to
TINYINT?
> Implement vectorized type casting for all types
> -----------------------------------------------
>
> Key: HIVE-4821
> URL: https://issues.apache.org/jira/browse/HIVE-4821
> Project: Hive
> Issue Type: Sub-task
> Affects Versions: vectorization-branch
> Reporter: Eric Hanson
>
> Implement vectorized support for casting from any type to any type.
> From the documentation:
> cast(expr as <type>): Converts the results of the expression expr to <type>
> e.g. cast('1' as BIGINT) will convert the string '1' to it integral
> representation. A null is returned if the conversion does not succeed
> The current supported internal types are:
> LONG
> DOUBLE
> STRING
> TIMESTAMP
> Before implementation, determine what are the semantics of explicit casting
> to types less general than the internal types. E.g. what if you cast DOUBLE
> to TINYINT? Can we just cast internally to LONG and let the output process
> cast to TINYINT?
> This JIRA includes all work to make casting operate end-to-end in a SQL query
> in vectorized mode, including updates to VectorizationContext.
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