[GitHub] [spark] maropu commented on issue #25190: [SPARK-28429][SQL] Support implicit cast string type to interval type in PromoteStrings

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maropu commented on issue #25190: [SPARK-28429][SQL] Support implicit cast string type to interval type in PromoteStrings
URL: https://github.com/apache/spark/pull/25190#issuecomment-513100522
 
 
   In postgresql, is this handled as implicit casts?  I checked a cast list in postgresql though, I couldn't find an entry, text -> interval, for implicit casts;
   ```
   postgres=# \dC text
                                  List of casts
       Source type    |    Target type    |      Function      |   Implicit?   
   -------------------+-------------------+--------------------+---------------
    "char"            | text              | text               | yes
    boolean           | text              | text               | in assignment
    character         | text              | text               | yes
    character varying | text              | (binary coercible) | yes
    cidr              | text              | text               | in assignment
    inet              | text              | text               | in assignment
    name              | text              | text               | yes
    pg_dependencies   | text              | (with inout)       | yes
    pg_ndistinct      | text              | (with inout)       | yes
    pg_node_tree      | text              | (binary coercible) | yes
    text              | "char"            | char               | in assignment
    text              | character         | (binary coercible) | yes
    text              | character varying | (binary coercible) | yes
    text              | name              | name               | yes
    text              | regclass          | regclass           | yes
    text              | xml               | xml                | no
    xml               | text              | (binary coercible) | in assignment
   (17 rows)
   ```
   In postgresql, it seems `select now() + '100 days'` is hanldes as `select now() + interval '100 days'` in the parser? (I'm not 100% sure though)

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