[QUESTION] Why does Apache Flink add `org.antlr` to pom.xml

[Juan Pan]

Hi folks,

Excuse me for this help-seeking email. I tried to query the related questions on Stack Overflow and Apache Pony archived emails, but there is no answer there.

From my understanding, Flink parses SQL with the help of JavaCC and Apache calcite. Therefore, why does Flink import Antlr at the same time? For what?

Could anyone give me some hints? Thanks in advance.

Best wishes,

Trista

 Juan Pan (Trista) 

                         

Senior DBA & PPMC of Apache ShardingSphere(Incubating)

E-mail: [hidden email]

[Benchao Li]

Hi Juan,

I searched in the repo, and only found two modules contains `org.antlr`:

1, flink-sql-client

2, flink-connector-hive

But they exist only because we need to exclude them from 'hive-exec' dependency.

BTW, where did you find flink importing `org.antlr` ?

Juan Pan <[hidden email]> 于2019年12月29日周日 下午3:07写道：

Hi folks,

Excuse me for this help-seeking email. I tried to query the related questions on Stack Overflow and Apache Pony archived emails, but there is no answer there.

From my understanding, Flink parses SQL with the help of JavaCC and Apache calcite. Therefore, why does Flink import Antlr at the same time? For what?

Could anyone give me some hints? Thanks in advance.

Best wishes,

Trista

 Juan Pan (Trista) 

                         

Senior DBA & PPMC of Apache ShardingSphere(Incubating)

E-mail: [hidden email]

--

[Juan Pan]

Hi Benchao,

Thanks for your reply, key word `antlr` appeared in three modules of master branch,

1. flink-python

2. flink-sql-client

3. flink-hive-connector

I also found just tag `exclusion` is used for `Antlr`, so the aim of which is to exclude it from 'hive-exec’ dependency, right? That makes sense.

We are exploring Apache Flink and Apache Calcite, very appreciated your prompt reply.

Regards,

Trista.

 Juan Pan (Trista) 

                         

Senior DBA & PPMC of Apache ShardingSphere(Incubating)

E-mail: [hidden email]

On 12/29/2019 15:22，[hidden email] wrote：

Hi Juan,

I searched in the repo, and only found two modules contains `org.antlr`:

1, flink-sql-client

2, flink-connector-hive

But they exist only because we need to exclude them from 'hive-exec' dependency.

BTW, where did you find flink importing `org.antlr` ?

Juan Pan <[hidden email]> 于2019年12月29日周日 下午3:07写道：

Hi folks,

Excuse me for this help-seeking email. I tried to query the related questions on Stack Overflow and Apache Pony archived emails, but there is no answer there.

From my understanding, Flink parses SQL with the help of JavaCC and Apache calcite. Therefore, why does Flink import Antlr at the same time? For what?

Could anyone give me some hints? Thanks in advance.

Best wishes,

Trista

 Juan Pan (Trista) 

                         

Senior DBA & PPMC of Apache ShardingSphere(Incubating)

E-mail: [hidden email]

--