Fix column size estimation (#858)

[birdstorm]

Cherry-pick #858

[birdstorm]

/run-all-tests

[birdstorm]

/run-all-tests

[marsishandsome]

LGTM

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (2.1@dfa7cca). Click here to learn what that means.
The diff coverage is 74.69%.

@@          Coverage Diff           @@
##             2.1     #884   +/-   ##
======================================
  Coverage       ?   53.45%           
  Complexity     ?     1114           
======================================
  Files          ?      151           
  Lines          ?     7002           
  Branches       ?      816           
======================================
  Hits           ?     3743           
  Misses         ?     2894           
  Partials       ?      365

Impacted Files	Coverage Δ	Complexity Δ
.../tikv/expression/visitor/IndexRangeSetBuilder.java	48% <0%> (ø)	4 <0> (?)
...java/com/pingcap/tikv/exception/TiKVException.java	0% <0%> (ø)	0 <0> (?)
.../src/main/java/com/pingcap/tikv/types/BitType.java	42.85% <0%> (ø)	3 <0> (?)
...t/src/main/java/com/pingcap/tikv/key/TypedKey.java	34.21% <0%> (ø)	5 <0> (?)
.../src/main/java/com/pingcap/tikv/types/SetType.java	42.42% <100%> (ø)	6 <0> (?)
...rc/main/java/com/pingcap/tikv/types/BytesType.java	76.66% <100%> (ø)	10 <2> (?)
...c/main/java/com/pingcap/tikv/meta/TiTableInfo.java	41.25% <100%> (ø)	16 <2> (?)
...main/java/com/pingcap/tikv/meta/TiIndexColumn.java	76.92% <100%> (ø)	7 <1> (?)
.../main/java/com/pingcap/tikv/meta/TiColumnInfo.java	58.77% <100%> (ø)	21 <1> (?)
.../com/pingcap/tikv/predicates/TiKVScanAnalyzer.java	57.07% <50%> (ø)	31 <0> (?)
... and 3 more

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