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try_propagate

query::promql::planner::matching_filters

Function try_propagate 

Source 
fn try_propagate(
    binary: &BinaryExpr,
    left_tags: &[String],
    right_tags: &[String],
    left_field_labels: &[String],
    right_field_labels: &[String],
) -> Result<BinaryExpr, &'static str>
Expand description

Err carries why the rewrite does not apply, for propagate to log.