Fix result set rows for DDL queries to be null, instead of empty array #26
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The result set for DDL queries (INSERT, UPDATE, DELETE etc.) is empty, i.e. it does not contain any columns or rows. Columns and rows should thus be represented by a null value. In contrast, an empty result set from a SELECT query will always contain a non-empty array of columns and may contain any number of rows (possibly an empty array of rows).
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The result set for DDL queries (INSERT, UPDATE, DELETE etc.) is empty,
i.e. it does not contain any columns or rows. Columns and rows should
thus be represented by a null value. In contrast, an empty result set
from a SELECT query will always contain a non-empty array of columns and
may contain any number of rows (possibly an empty array of rows).
Builds on top of #20