Function transform_array_elements_by_ctx 

fn transform_array_elements_by_ctx(
    arr: &mut [Value],
    transformer: &GreptimeTransformer,
    is_v1: bool,
    schema_info: &mut SchemaInfo,
    pipeline_ctx: &PipelineContext<'_>,
    tablesuffix_template: Option<&TableSuffixTemplate>,
) -> Result<HashMap<ContextOpt, Vec<(Row, Option<String>)>>>

Transforms an array of VRL values into rows grouped by their ContextOpt. Each element can have its own ContextOpt for per-row configuration.