Create a schema query for the Sql Query generator

[yruslan]

Background

Sometimes we want to get query the source JDBC database just to fetch the schema. In this case we need to ensure the query doesn't return any records.

The schema query is the same as data query, just with contradicting WHERE condition.

Feature

Create a schema query for the Sql Query generator.

Example [Optional]

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Proposed Solution [Optional]

Add either WHERE 0=1 or AND 0=1 for the data query to get the schema query.