分库分表：聚合函数含groupby字句

[codecov[bot]]

Codecov Report

Merging #193 (55cd43c) into dev (c79a850) will decrease coverage by 0.31%. The diff coverage is 82.02%.

@@            Coverage Diff             @@
##              dev     #193      +/-   ##
==========================================
- Coverage   86.16%   85.85%   -0.31%     
==========================================
  Files          43       44       +1     
  Lines        3087     3274     +187     
==========================================
+ Hits         2660     2811     +151     
- Misses        345      372      +27     
- Partials       82       91       +9     

Impacted Files	Coverage Δ
internal/merger/utils/scan.go	60.86% <60.86%> (ø)
...nternal/merger/groupby_merger/aggregator_merger.go	83.60% <83.60%> (ø)
internal/merger/aggregatemerger/aggregator/avg.go	100.00% <100.00%> (ø)
...nternal/merger/aggregatemerger/aggregator/count.go	100.00% <100.00%> (ø)
internal/merger/aggregatemerger/aggregator/max.go	100.00% <100.00%> (ø)
internal/merger/aggregatemerger/aggregator/min.go	100.00% <100.00%> (ø)
internal/merger/aggregatemerger/aggregator/sum.go	100.00% <100.00%> (ø)
internal/merger/aggregatemerger/merger.go	93.52% <100.00%> (+1.36%)	:arrow_up:
internal/merger/sortmerger/merger.go	89.90% <100.00%> (ø)

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