Add context support

[lunny]

No description provided.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@6bc9412). Click here to learn what that means.
The diff coverage is 7.54%.

@@            Coverage Diff            @@
##             master      #46   +/-   ##
=========================================
  Coverage          ?   18.01%           
=========================================
  Files             ?       15           
  Lines             ?     1027           
  Branches          ?        0           
=========================================
  Hits              ?      185           
  Misses            ?      825           
  Partials          ?       17

Impacted Files	Coverage Δ
driver.go	0% <ø> (ø)
index.go	0% <ø> (ø)
cache.go	0% <ø> (ø)
column.go	0% <ø> (ø)
mapper.go	60.39% <ø> (ø)
pk.go	100% <ø> (ø)
dialect.go	0% <ø> (ø)
filter.go	0% <ø> (ø)
type.go	0% <ø> (ø)
table.go	35.71% <ø> (ø)
... and 5 more

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