Revert input variable to 'source'

[codecov[bot]]

Codecov Report

Merging #758 (7871815) into master (d7dde9e) will decrease coverage by 0.00%. The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master     #758      +/-   ##
============================================
- Coverage     55.15%   55.14%   -0.01%     
+ Complexity     3164     3163       -1     
============================================
  Files           748      748              
  Lines         20395    20395              
  Branches       1339     1339              
============================================
- Hits          11249    11247       -2     
- Misses         8660     8661       +1     
- Partials        486      487       +1     

Impacted Files	Coverage Δ	Complexity Δ
...main/java/com/spotify/heroic/metric/FullQuery.java	32.00% <0.00%> (ø)	7.00 <0.00> (ø)
...main/java/com/spotify/heroic/shell/task/Fetch.java	10.29% <0.00%> (ø)	2.00 <0.00> (ø)
...potify/heroic/metric/datastax/DatastaxBackend.java	27.27% <0.00%> (ø)	21.00 <0.00> (ø)
...potify/heroic/metric/bigtable/BigtableBackend.java	85.81% <50.00%> (ø)	61.00 <1.00> (ø)
...java/com/spotify/heroic/grammar/QueryExpression.kt	90.00% <66.66%> (ø)	10.00 <1.00> (ø)
...n/java/com/spotify/heroic/metric/QueryMetrics.java	82.60% <75.00%> (+0.79%)	4.00 <0.00> (ø)
...omponent/src/main/java/com/spotify/heroic/Query.kt	100.00% <100.00%> (ø)	7.00 <1.00> (ø)
...src/main/java/com/spotify/heroic/QueryBuilder.java	70.17% <100.00%> (-0.52%)	16.00 <3.00> (ø)
...c/main/java/com/spotify/heroic/metric/FetchData.kt	90.47% <100.00%> (ø)	3.00 <0.00> (ø)
...main/java/com/spotify/heroic/CoreQueryManager.java	75.53% <100.00%> (ø)	10.00 <0.00> (ø)
... and 3 more

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