.
I noticed two problems. I solve the first one, but for the completeness of the description of this issue, I am recording it here -- there is a grammar rule target named `string` which conflicts with the name of Go type string. My solution is to rename the grammar rule target from `string` into `char_string` as in [this pull request](
https://github.com/apache/hive/pull/654), which passed HIve's CI.
What is bothering me now is the second issue. When I run `go build` with the generated code, it complains that
```
./hplsql_parser.go:4467:8: undefined: _input
./hplsql_parser.go:24587:9: undefined: _input
./hplsql_parser.go:26203:8: undefined: _input
./hplsql_parser.go:26204:4: undefined: _input
./hplsql_parser.go:26205:4: undefined: _input
./hplsql_parser.go:26206:4: undefined: _input
./hplsql_parser.go:26207:4: undefined: _input
./hplsql_parser.go:26208:4: undefined: _input
./hplsql_parser.go:34592:8: undefined: _input
./hplsql_parser.go:37616:11: undefined: _input
./hplsql_parser.go:37616:11: too many errors
```