Github user mmolimar commented on the issue:
https://github.com/apache/spark/pull/18447
Hi @HyukjinKwon
For me it's fine:
"In some SQL db you have to query explicitly the table schema, ie: select
data_type from all_tab_columns where table_name = 'my_table'or something like
that.
In case of the ARQ engine from Apache Jena you can call this function in
SPARQL (see
[W3C-SPARQL](https://www.w3.org/TR/rdf-sparql-query/#func-datatype)).
I find it useful in order to avoid to query the schema."
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