Function lookup_join_hashmap 

fn lookup_join_hashmap(
    build_hashmap: &PruningJoinHashMap,
    build_batch: &RecordBatch,
    probe_batch: &RecordBatch,
    build_on: &[PhysicalExprRef],
    probe_on: &[PhysicalExprRef],
    random_state: &RandomState,
    null_equality: NullEquality,
    hashes_buffer: &mut Vec<u64>,
    deleted_offset: Option<usize>,
) -> Result<(UInt64Array, UInt32Array)>

This method performs lookups against JoinHashMap by hash values of join-key columns, and handles potential hash collisions.

Arguments

• build_hashmap - hashmap collected from build side data.
• build_batch - Build side record batch.
• probe_batch - Probe side record batch.
• build_on - An array of columns on which the join will be performed. The columns are from the build side of the join.
• probe_on - An array of columns on which the join will be performed. The columns are from the probe side of the join.
• random_state - The random state for the join.
• null_equality - Indicates whether NULL values should be treated as equal when joining.
• hashes_buffer - Buffer used for probe side keys hash calculation.
• deleted_offset - deleted offset for build side data.

Returns

A Result containing a tuple with two equal length arrays, representing indices of rows from build and probe side, matched by join key columns.