[parser] model: add a function GetTypeDesc for ColumnInfo (#659)
[parser] model: add a function GetTypeDesc for ColumnInfo (#659)


ngaut/tidb,coocood/tidb,c4pt0r/tidb,coocood/tidb,kyle-wang/tidb,ngaut/tidb,c4pt0r/tidb,ngaut/tidb,pingcap/tidb,c4pt0r/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb,c4pt0r/tidb,ngaut/tidb,kyle-wang/tidb,kyle-wang/tidb,kyle-wang/tidb,c4pt0r/tidb,pingcap/tidb,kyle-wang/tidb,pingcap/tidb,c4pt0r/tidb,kyle-wang/tidb