tuple_intersection_double function

Applies to: Databricks Runtime 18.1 and above

Computes the set intersection of exactly two TupleSketch binary representations with double summaries.

Syntax

tuple_intersection_double ( first, second [, mode ] )

Arguments

• first: A TupleSketch in binary format with double summaries.
• second: A TupleSketch in binary format with double summaries.
• mode: An optional STRING literal specifying the aggregation mode. Valid values: 'sum', 'min', 'max', 'alwaysone'. The default is 'sum'.

Returns

A BINARY value containing the TupleSketch representing the intersection.

Notes

• The result contains only keys that appear in both input sketches.
• For intersecting more than two sketches, use tuple_intersection_agg_double.

Error messages

• TUPLE_INVALID_INPUT_SKETCH_BUFFER

Examples

> SELECT tuple_sketch_estimate_double(
    tuple_intersection_double(
      tuple_sketch_agg_double(col1, val1),
      tuple_sketch_agg_double(col2, val2)
    )
  ) FROM VALUES (1, 1.0D, 1, 4.0D), (2, 2.0D, 2, 5.0D), (3, 3.0D, 4, 6.0D) tab(col1, val1, col2, val2);
2.0

Related

• tuple_intersection_integer function
• tuple_intersection_agg_double aggregate function