*.:support check table stmt #718

[hustjieke]

[summary] support check stmt:

CHECK {TABLE | TABLES} tbl_name [, tbl_name] ... [option] ...

option: {
    FOR UPGRADE
  | QUICK
  | FAST
  | MEDIUM
  | EXTENDED
  | CHANGED
}

[test case] sqlparser/parse_test.go src/planner/others_plan_test.go src/proxy/table_maintenance_test.go

[patch codecov] src/planner/others_plan.go 94.9% src/proxy/table_maintenance.go 100% src/proxy/query.go 94.8% src/vendor/github.com/xelabs/go-mysqlstack/sqlparser/ast.go 87.5%

[codecov[bot]]

Codecov Report

Merging #723 (eaf3d40) into master (7c4781a) will increase coverage by 0%. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #723   +/-   ##
=====================================
  Coverage      89%    89%           
=====================================
  Files         133    133           
  Lines        9370   9406   +36     
=====================================
+ Hits         8364   8400   +36     
  Misses        665    665           
  Partials      341    341           

Impacted Files	Coverage Δ
src/planner/others_plan.go	92% <100%> (+1%)	:arrow_up:
src/proxy/query.go	93% <100%> (+<1%)	:arrow_up:
src/proxy/table_maintenance.go	100% <100%> (ø)
src/backend/xacheck.go	80% <0%> (-2%)	:arrow_down:
src/backend/txn.go	86% <0%> (-1%)	:arrow_down:
src/executor/engine/merge_join.go	96% <0%> (+1%)	:arrow_up:
src/router/api.go	91% <0%> (+2%)	:arrow_up:

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[BohuTANG]

LGTM