.join_spy_impl

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

.join_spy_impl function

<dl><dt>x</dt>
<dd>Left data frame.</dd>
<dt>y</dt>
<dd>Right data frame.</dd>
<dt>by</dt>
<dd>Column names.</dd>
<dt>type</dt>
<dd>Join type.</dd>
<dt>verbose</dt>
<dd>Print output.</dd>
<dt>.quiet</dt>
<dd>Suppress all output (overrides verbose).</dd>
<dt>...</dt>
<dd>Additional args to merge.</dd></dl>

Arguments

Internal join wrapper helper — .join_spy_impl

<dl>

<dt>x</dt>
<dd>Left data frame.</dd>


<dt>y</dt>
<dd>Right data frame.</dd>


<dt>by</dt>
<dd>Column names.</dd>


<dt>type</dt>
<dd>Join type.</dd>


<dt>verbose</dt>
<dd>Print output.</dd>


<dt>.quiet</dt>
<dd>Suppress all output (overrides verbose).</dd>


<dt>...</dt>
<dd>Additional args to merge.</dd>

</dl>

.join_spy_impl: Internal join wrapper helper

Description

Usage

Value

Arguments