benj created DRILL-7375:
---------------------------
Summary: composite type map cast/convert_to
Key: DRILL-7375
URL: https://issues.apache.org/jira/browse/DRILL-7375
Project: Apache Drill
Issue Type: Wish
Components: Functions - Drill
Affects Versions: 1.16.0
Reporter: benj
As it possible to cast varchar to map (JSON) with convert_from
{code:sql}
SELECT a, typeof(a) from (SELECT CONVERT_FROM('{a : 100, b: 200}' ,'JSON') a);
+-------------------+--------+
| a | EXPR$1 |
+-------------------+--------+
| {"a":100,"b":200} | MAP |
+-------------------+--------+
{code}
It will be very usefull to have the capacity to "cast" the _MAP_ into VARCHAR
with a "cast syntax" or with a "convert_to" possibility
Please note that these possibility of course exists in other database systems
(example postgres : _SELECT '{"a":100,"b":200}'::json::text_)
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