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analyze_pattern

uni_query::query::df_graph::pattern_comprehension

Function analyze_pattern 

Source 
pub fn analyze_pattern(
    pattern: &Pattern,
    input_schema: &Schema,
    uni_schema: &Schema,
) -> Result<(String, Vec<TraversalStep>)>
Expand description

Analyze a pattern to extract the anchor column and traversal steps.

The anchor is the first node in the pattern whose variable has {var}._vid in the input schema. The remaining nodes/edges become traversal steps.