A descriptor of the specific SQL DDL statements required to manage a specific Comet table in a JDBC-accessible database engine
A descriptor of the specific SQL DDL statements required to manage a specific Comet table in a JDBC-accessible database engine
the SQL Create Table statement with the database-specific type, constraints etc. tacked on.
a cheap SQL query whose results are irrelevant but guaranteed to trigger an error in case the table is absent
pingSql is optional, and will default to select * from
name where 1=0
as Spark SQL does