fn get_encoding(
scx: &StatementContext<'_>,
format: &FormatSpecifier<Aug>,
envelope: &SourceEnvelope,
) -> Result<SourceDataEncoding<ReferencedConnection>, PlanError>fn get_encoding(
scx: &StatementContext<'_>,
format: &FormatSpecifier<Aug>,
envelope: &SourceEnvelope,
) -> Result<SourceDataEncoding<ReferencedConnection>, PlanError>