Schema with TypeInformation or DataType

[tison]

Hi,

I notice that our type system has two branches. One  is TypeInformation while the other is

DataType. It is said that Table API will use DataType but there are several questions about

this statement:

1. Will TypeInformation be deprecated and we use DataType as type system everywhere?

2. Schema in Table API currently support only TypeInformation to register a field, shall we support

the DataType way as well?

[godfrey he]

Hi tison,

>1. Will TypeInformation be deprecated and we use DataType as type system everywhere?

AFAIK, runtime will still supports TypeInformation, while table module supports DataType

> 2. Schema in Table API currently support only TypeInformation to register a field, shall we support

the DataType way as well?

Schema also supports DataType since FLINK-14645[1]

[1] https://issues.apache.org/jira/browse/FLINK-14645

Best,

Godfrey

tison <[hidden email]> 于2020年4月17日周五 下午2:14写道：

Hi,

I notice that our type system has two branches. One  is TypeInformation while the other is

DataType. It is said that Table API will use DataType but there are several questions about

this statement:

1. Will TypeInformation be deprecated and we use DataType as type system everywhere?

2. Schema in Table API currently support only TypeInformation to register a field, shall we support

the DataType way as well?

Best,

tison.

[Jark Wu-3]

Hi Tison,

Migration from TypeInformation to DataType is a large work and will across many releases. As far as I can tell, we will finalize the work in 1.11.

As godfrey said above, Flink SQL & Table API should always use DataType, DataStream uses TypeInformation. 

Schema already supports DataType to register a field, and the the method using TypeInformation to register field is deprecated since 1.10. 

Best,

Jark

On Fri, 17 Apr 2020 at 14:14, tison <[hidden email]> wrote:

Hi,

I notice that our type system has two branches. One  is TypeInformation while the other is

DataType. It is said that Table API will use DataType but there are several questions about

this statement:

1. Will TypeInformation be deprecated and we use DataType as type system everywhere?

2. Schema in Table API currently support only TypeInformation to register a field, shall we support

the DataType way as well?

Best,

tison.

[tison]

Thanks for your inputs and sorry that I said Schema doesn't support DataType to register a field because I was looking into Flink 1.9 codes...

Jark Wu <[hidden email]> 于2020年4月17日周五 下午2:42写道：

Hi Tison,

Migration from TypeInformation to DataType is a large work and will across many releases. As far as I can tell, we will finalize the work in 1.11.

As godfrey said above, Flink SQL & Table API should always use DataType, DataStream uses TypeInformation. 

Schema already supports DataType to register a field, and the the method using TypeInformation to register field is deprecated since 1.10. 

Best,

Jark

On Fri, 17 Apr 2020 at 14:14, tison <[hidden email]> wrote:

Hi,

I notice that our type system has two branches. One  is TypeInformation while the other is

DataType. It is said that Table API will use DataType but there are several questions about

this statement:

1. Will TypeInformation be deprecated and we use DataType as type system everywhere?

2. Schema in Table API currently support only TypeInformation to register a field, shall we support

the DataType way as well?

Best,

tison.