kkhatua opened a new pull request #1483: DRILL-3988: Expose Drill built-in functions & UDFs in a system table URL: https://github.com/apache/drill/pull/1483 This commit exposes available SQL functions in Drill and also detects UDFs that have been dynamically loaded into Drill. An example is shown below for 2 UDFs dynamically loaded into the cluster, along side the existing built-in functions that come with Drill. ``` 0: jdbc:drill:schema=sys> select source, count(*) as functionCount from sys.functions group by source; +-----------------------------------------+----------------+ | source | functionCount | +-----------------------------------------+----------------+ | built-in | 2704 | | simple-drill-function-1.0-SNAPSHOT.jar | 12 | | drill-url-tools-1.0.jar | 1 | +-----------------------------------------+----------------+ 1 row selected (0.211 seconds) ``` The system table exposes information as shown. Since UDFs are lazily initialized (i.e. only when a SQL query needs it), the `returnType` is not available and listed as `n/a`. Once the UDF is initialized, the `returnType` is also available. The `random(FLOAT8-REQUIRED,FLOAT8-REQUIRED)` function is an example of a lazily loaded UDF (see `returnType`). The `url_parse(VARCHAR-REQUIRED)` function is an example of an initialized UDF (see `returnType`). Rest are built-in functions that meet the query's filter criteria. ``` 0: jdbc:drill:schema=sys>select * from sys.functions where name like 'random' or `name` like '%url%'; +-------------+----------------------------------+-------------+-----------------------------------------+ | name | signature | returnType | source | +-------------+----------------------------------+-------------+-----------------------------------------+ | parse_url | VARCHAR-REQUIRED | LATE | built-in | | random | | FLOAT8 | built-in | | random | FLOAT8-REQUIRED,FLOAT8-REQUIRED | n/a | simple-drill-function-1.0-SNAPSHOT.jar | | url_decode | VARCHAR-REQUIRED | VARCHAR | built-in | | url_encode | VARCHAR-REQUIRED | VARCHAR | built-in | | url_parse | VARCHAR-REQUIRED | LATE | drill-url-tools-1.0.jar | +-------------+----------------------------------+-------------+-----------------------------------------+ 6 rows selected (0.221 seconds) ```
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