answer for the "rowid" column in a WITHOUT ROWID table. Enhance it so that
it can be used to check for the existence of a table by setting the column
name parameter to NULL. The routine is now included in the build by
default, even without the SQLITE_ENABLE_COLUMN_METADATA compile-time option.
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without requiring the SQLITE_ENABLE_COLUMN_METADATA compile-time option.
Other sqlite3_column_* interfaces that have a run-time penalty even if they
are unused still require the SQLITE_ENABLE_COLUMN_METADATA option at
compile-time.
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