Merge pull request #726 from zhyass/feature_set

*: add config lower-case-table-names to support case insensitive tabl…

Merge pull request #696 from hustjieke/feature_complete_truncate_drop…

…_table_stmt_#690

sqlparser: complete truncate/drop table syntax #690

Merge pull request #688 from zhyass/feature_set

*: fix the bug loadbalance does not take effect in streaming fetch st…

Merge pull request #637 from zhyass/feature_set

intergration: add set statement test cases #629

Merge pull request #625 from hustjieke/feature_complete_create_interg…

…ration_#613

intergration: complete create.test #613

Merge pull request #621 from zhyass/feature_show

proxy: add hint for streaming fetch #619

Merge pull request #616 from zhyass/feature_show

go-mysqlstack: fix the panic close of closed channel #614

* : complete create index syntax support #592

[summary]
1. create index syntax.
CREATE [UNIQUE | FULLTEXT | SPATIAL] INDEX index_name
    ON tbl_name (key_part,...)
    [index_option]
    [algorithm_option | lock_option] ...

key_part:
    col_name [(length)]

index_option:
    KEY_BLOCK_SIZE [=] value
  | index_type
  | WITH PARSER NGRAM
  | COMMENT 'string'

index_type:
    USING {BTREE | HASH}

algorithm_option:
    ALGORITHM [=] {DEFAULT | INPLACE | COPY}

lock_option:
    LOCK [=] {DEFAULT | NONE | SHARED | EXCLUSIVE}

2. create table index definition syntax.
index_definition:
    PRIMARY KEY (key_part,...)
  | UNIQUE [index_or_key] index_name (key_part,...) [index_option]
  | index_or_key index_name (key_part,...) [index_option]
  | FULLTEXT index_or_key index_name (key_part,...) [index_option]
  | SPATIAL index_or_key index_name (key_part,...) [index_option]

index_or_key:
    INDEX
  | KEY

[test case]
src/planner/ddl_plan_test.go
src/vendor/github.com/xelabs/go-mysqlstack/sqlparser/ddl_test.go
src/vendor/github.com/xelabs/go-mysqlstack/sqlparser/parse_test.go
[patch codecov]
src/planner/ddl_plan.go 93.8%
src/vendor/github.com/xelabs/go-mysqlstack/sqlparser/ast.go 86.4%

proxy: forbid radon cleanup admin when readonly #578

[summary]
Part of radon admin operations api need to add restrictions when radon in readonly.
[test case]
src/proxy/admin_cleanup_test.go
[patch codecov]
src/proxy/query.go 88.2%

*: add cleanup handle #569

[summary]
add cleanup admin to support clean up the old data after shifted.
syntax:
radon cleanup;
[test case]
src/ctl/v1/shard_test.go
src/proxy/admin_cleanup_test.go
src/proxy/proxy_test.go
src/proxy/radon_test.go
src/vendor/github.com/xelabs/go-mysqlstack/sqlparser/radon_test.go
[patch codecov]
src/ctl/v1/shard.go 90.9%
src/proxy/admin_cleanup.go 100%
src/proxy/proxy.go 85.6%
src/proxy/radon.go 77.8%
src/vendor/github.com/xelabs/go-mysqlstack/sqlparser/ast.go 85.9%