Struct MergeQueryResult 

pub struct MergeQueryResult {
    pub stream: Pin<Box<dyn RecordBatchStream<Item = Result<RecordBatch, DataFusionError>> + Send>>,
    pub ordering_honored: bool,
}

The outcome of running a merge query.

Fields

stream: Pin<Box<dyn RecordBatchStream<Item = Result<RecordBatch, DataFusionError>> + Send>>

The merged rows.

ordering_honored: bool

Whether the merger’s declared scan ordering (if any) was honored by the physical plan without falling back to a buffering Sort node. Always true for the concatenate strategy’s undeclared shape (ScanOrdering::Unordered) – there is no declared ordering to defeat – and only ever computed dynamically for the two strategies that declare one. This drives only a memory-regression warning; it never gates the recorded sort_order (see View::get_merged_partition_sort_order).

For the sort-merge strategy (ScanOrdering::PerFile), a surviving SortPreservingMergeExec is the expected operator, not a regression – only a surviving SortExec means the streaming shape was lost. For the concatenate strategy’s declared shape (ScanOrdering::Concatenated), either operator surviving is a regression.