[
https://issues.apache.org/jira/browse/FLINK-39049?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jinkun Liu updated FLINK-39049:
-------------------------------
Description:
||SQL Function||Table Function||Description||
|VARIANT_GET(variant, path[, returnType])|VARIANT.variantGet(variant, path[,
returnType])|Extracts a sub-value from a Variant using the specified path and
casts it to the target type.
If the path does not exist or is invalid, this function returns {{{}NULL{}}}.
If the target return type is incompatible with the extracted value, this
function throws an error.
{{```sql}}
{{– TRUE}}
{{VARIANT_GET(PARSE_JSON('\{"a": true}'), '$.a', 'BOOLEAN')}}
{{– NULL (path does not exist)}}
{{VARIANT_GET(PARSE_JSON('\{"a": true}'), '$.b', 'INT')}}
{{– throws: cannot cast VARIANT(STRING) to INTVARIANT_GET(PARSE_JSON('\{"a":
"oops"}'), '$.a', 'INT')}}
{{```\|}}|
|TRY_VARIANT_GET(variant, path[, returnType])|VARIANT.tryVariantGet(variant,
path[, returnType])|Similar to {{{}VARIANT_GET{}}}, but returns {{NULL}}
instead of throwing an error when the extracted value cannot be cast to the
target return type.
If the path does not exist or is invalid, this function also returns
{{{}NULL{}}}.
```sql
– TRUE
VARIANT_GET(PARSE_JSON('\{"a": true}'), '$.a', 'BOOLEAN')
– NULL (path does not exist)
VARIANT_GET(PARSE_JSON('\{"a": true}'), '$.b', 'INT')
– NULL
VARIANT_GET(PARSE_JSON('\{"a": "oops"}'), '$.a', 'INT')
```\||
*reference：*
[https://downloads.apache.org/spark/docs/4.2.0-preview3/api/sql/variant-functions/#try_variant_get]
[https://docs.snowflake.com/en/sql-reference/functions/get]
was:
||SQL Function||Table Function||Description||
|VARIANT_GET(variant, path[, returnType])|VARIANT.variantGet(variant, path[,
returnType])|Extracts a sub-value from a Variant using the specified path and
casts it to the target type.
If the path does not exist or is invalid, this function returns {{{}NULL{}}}.
If the target return type is incompatible with the extracted value, this
function throws an error.
{{```sql}}
-- TRUE
VARIANT_GET(PARSE_JSON('\{"a": true}'), '$.a', 'BOOLEAN')
-- NULL (path does not exist)
VARIANT_GET(PARSE_JSON('\{"a": true}'), '$.b', 'INT')
-- throws: cannot cast VARIANT(STRING) to INT
VARIANT_GET(PARSE_JSON('\{"a": "oops"}'), '$.a', 'INT'){{```}}|
|TRY_VARIANT_GET(variant, path[, returnType])|VARIANT.tryVariantGet(variant,
path[, returnType])|Similar to {{{}VARIANT_GET{}}}, but returns {{NULL}}
instead of throwing an error when the extracted value cannot be cast to the
target return type.
If the path does not exist or is invalid, this function also returns
{{{}NULL{}}}.
```sql
-- TRUE
VARIANT_GET(PARSE_JSON('\{"a": true}'), '$.a', 'BOOLEAN')
-- NULL (path does not exist)
VARIANT_GET(PARSE_JSON('\{"a": true}'), '$.b', 'INT')
-- NULL
VARIANT_GET(PARSE_JSON('\{"a": "oops"}'), '$.a', 'INT')
```|
*reference：*
[https://downloads.apache.org/spark/docs/4.2.0-preview3/api/sql/variant-functions/#try_variant_get]
[https://docs.snowflake.com/en/sql-reference/functions/get]
> Introduce built-in functions `VARIANT_GET` and `TRY_VARIANT_GET ` to extract
> values from a variant
> --------------------------------------------------------------------------------------------------
>
> Key: FLINK-39049
> URL: https://issues.apache.org/jira/browse/FLINK-39049
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Reporter: Jinkun Liu
> Assignee: Jinkun Liu
> Priority: Minor
>
> ||SQL Function||Table Function||Description||
> |VARIANT_GET(variant, path[, returnType])|VARIANT.variantGet(variant, path[,
> returnType])|Extracts a sub-value from a Variant using the specified path and
> casts it to the target type.
>
> If the path does not exist or is invalid, this function returns {{{}NULL{}}}.
> If the target return type is incompatible with the extracted value, this
> function throws an error.
>
> {{```sql}}
> {{– TRUE}}
> {{VARIANT_GET(PARSE_JSON('\{"a": true}'), '$.a', 'BOOLEAN')}}
>
> {{– NULL (path does not exist)}}
> {{VARIANT_GET(PARSE_JSON('\{"a": true}'), '$.b', 'INT')}}
>
> {{– throws: cannot cast VARIANT(STRING) to INTVARIANT_GET(PARSE_JSON('\{"a":
> "oops"}'), '$.a', 'INT')}}
> {{```\|}}|
> |TRY_VARIANT_GET(variant, path[, returnType])|VARIANT.tryVariantGet(variant,
> path[, returnType])|Similar to {{{}VARIANT_GET{}}}, but returns {{NULL}}
> instead of throwing an error when the extracted value cannot be cast to the
> target return type.
>
> If the path does not exist or is invalid, this function also returns
> {{{}NULL{}}}.
> ```sql
> – TRUE
> VARIANT_GET(PARSE_JSON('\{"a": true}'), '$.a', 'BOOLEAN')
> – NULL (path does not exist)
> VARIANT_GET(PARSE_JSON('\{"a": true}'), '$.b', 'INT')
> – NULL
> VARIANT_GET(PARSE_JSON('\{"a": "oops"}'), '$.a', 'INT')
> ```\||
>
> *reference：*
> [https://downloads.apache.org/spark/docs/4.2.0-preview3/api/sql/variant-functions/#try_variant_get]
> [https://docs.snowflake.com/en/sql-reference/functions/get]
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