sqlparser: add drop index "lock | algorithm option" #693

[hustjieke]

[summary]

1. Add drop index "lock | algorithm option".
2. Refactor lock_algorithm_option in create index.

[test case] src/proxy/ddl_test.go src/vendor/github.com/xelabs/go-mysqlstack/sqlparser/ddl_test.go

[patch codecov] src/vendor/github.com/xelabs/go-mysqlstack/sqlparser/ast.go 96.2% src/vendor/github.com/xelabs/go-mysqlstack/sqlparser/ast_funcs.go 95.4% src/vendor/github.com/xelabs/go-mysqlstack/sqlparser/sql.go 69.6%

[codecov[bot]]

Codecov Report

Merging #697 (fc10792) into master (af586a4) will decrease coverage by 0%. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #697   +/-   ##
=====================================
- Coverage      89%    89%   -1%     
=====================================
  Files         130    130           
  Lines        9279   9279           
=====================================
- Hits         8269   8267    -2     
- Misses        669    670    +1     
- Partials      341    342    +1     

Impacted Files	Coverage Δ
src/backend/txn.go	87% <0%> (-1%)	:arrow_down:

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[zhyass]

Is there something wrong with the original code? If it is just to be consistent with the implementation of mysql, and the original implementation result is no problem, I think there is no need to modify it.

[zhyass]

LGTM