.analyze_multicolumn_keys

For composite keys, determines which column(s) cause mismatches.

internal

Provides diagnostic tools for understanding and debugging data frame
joins. Analyzes key columns before joining to detect duplicates, mismatches,
encoding issues, and other common problems. Explains unexpected row count
changes and provides safe join wrappers with cardinality enforcement. Concepts
and diagnostics build on tidy data principles as described in Wickham (2014)
<doi:10.18637/jss.v059.i10>.

Gilles Colling

joinspy

Diagnostic Tools for Data Frame Joins

.analyze_multicolumn_keys function

<dl><dt>x</dt>
<dd>Data frame (left table).</dd>
<dt>y</dt>
<dd>Data frame (right table).</dd>
<dt>x_by</dt>
<dd>Column names in x.</dd>
<dt>y_by</dt>
<dd>Column names in y.</dd></dl>

Arguments

Analyze Multi-Column Key Breakdown — .analyze_multicolumn_keys

<dl>

<dt>x</dt>
<dd>Data frame (left table).</dd>


<dt>y</dt>
<dd>Data frame (right table).</dd>


<dt>x_by</dt>
<dd>Column names in x.</dd>


<dt>y_by</dt>
<dd>Column names in y.</dd>

</dl>

.analyze_multicolumn_keys: Analyze Multi-Column Key Breakdown

Description

Usage

Value

Arguments