[jira] [Updated] (PIG-5404) FLATTEN infers wrong datatype

["Koji Noguchi (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-5404?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Koji Noguchi updated PIG-5404:
------------------------------
    Priority: Blocker  (was: Critical)

> FLATTEN infers wrong datatype
> -----------------------------
>
>                 Key: PIG-5404
>                 URL: https://issues.apache.org/jira/browse/PIG-5404
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: 0.17.0
>            Reporter: Bruno Pusztahazi
>            Assignee: Koji Noguchi
>            Priority: Blocker
>              Labels: datatypes, flatten
>
> In version 0.12 (checked out branch-0.12) the following code works as expected:
> With the following input file test.csv:
>  
> {code:java}
> John_5,18,4.0F
> Mary_6,19,3.8F
> Bill_7,20,3.9F
> Joe_8,18,3.8F{code}
>  
>  
> {code:java}
> A = LOAD 'test.csv' USING PigStorage (',') AS (name:chararray,age:int,gpr:float);
> B = FOREACH A GENERATE FLATTEN(STRSPLIT(name,'_')) as (name1:chararray,name2:chararray),age,gpr;
> DESCRIBE B;{code}
> and produces the following output:
>  
> {code:java}
> B: {name1: chararray,name2: chararray,age: int,gpr: float}
> {code}
> This is the expected output as the result of flatten is defined as chararrays.
>  
> When using version 0.17 (checkout out branch-0.17) the code produces:
> {code:java}
> B: {name1: bytearray,name2: bytearray,age: int,gpr: float}
> {code}
> This shows that somehow FLATTEN inferred wrong data types (bytearray instead of chararay).
>  
> Using explicit casting as a workaround on 0.17:
> {code:java}
> B1 = FOREACH B GENERATE (chararray)name1,(chararray)name2,age,gpr;
> DESCRIBE B1;{code}
> produces
> {code:java}
> B1: {name1: chararray,name2: chararray,age: int,gpr: float}
> {code}
> This time with the expected data types.
>  
> The plan explain show some strange cast operators that are not really used (or at least the actual data types are wrong):
> {code:java}
> #-----------------------------------------------
> # New Logical Plan:
> #-----------------------------------------------
> B: (Name: LOStore Schema: name1#121:chararray,name2#122:chararray,age#105:int,gpr#106:float)
> |
> |---B: (Name: LOForEach Schema: name1#121:chararray,name2#122:chararray,age#105:int,gpr#106:float)
>     |   |
>     |   (Name: LOGenerate[false,false,false,false] Schema: name1#121:chararray,name2#122:chararray,age#105:int,gpr#106:float)ColumnPrune:OutputUids=[121, 105, 122, 106]ColumnPrune:InputUids=[121, 105, 122, 106]
>     |   |   |
>     |   |   (Name: Cast Type: chararray Uid: 121)
>     |   |   |
>     |   |   |---name1:(Name: Project Type: bytearray Uid: 121 Input: 0 Column: 0)
>     |   |   |
>     |   |   (Name: Cast Type: chararray Uid: 122)
>     |   |   |
>     |   |   |---name2:(Name: Project Type: bytearray Uid: 122 Input: 1 Column: 0)
>     |   |   |
>     |   |   age:(Name: Project Type: int Uid: 105 Input: 2 Column: 0)
>     |   |   |
>     |   |   gpr:(Name: Project Type: float Uid: 106 Input: 3 Column: 0)
>     |   |
>     |   |---(Name: LOInnerLoad[0] Schema: name1#121:bytearray)
>     |   |
>     |   |---(Name: LOInnerLoad[1] Schema: name2#122:bytearray)
>     |   |
>     |   |---(Name: LOInnerLoad[2] Schema: age#105:int)
>     |   |
>     |   |---(Name: LOInnerLoad[3] Schema: gpr#106:float)
>     |
>     |---B: (Name: LOForEach Schema: name1#135:bytearray,name2#136:bytearray,age#105:int,gpr#106:float)
>         |   |
>         |   (Name: LOGenerate[true,false,false] Schema: name1#135:bytearray,name2#136:bytearray,age#105:int,gpr#106:float)
>         |   |   |
>         |   |   (Name: UserFunc(org.apache.pig.builtin.STRSPLIT) Type: tuple Uid: 132)
>         |   |   |
>         |   |   |---(Name: Cast Type: chararray Uid: 104)
>         |   |   |   |
>         |   |   |   |---name:(Name: Project Type: bytearray Uid: 104 Input: 0 Column: (*))
>         |   |   |
>         |   |   |---(Name: Constant Type: chararray Uid: 131)
>         |   |   |
>         |   |   (Name: Cast Type: int Uid: 105)
>         |   |   |
>         |   |   |---age:(Name: Project Type: bytearray Uid: 105 Input: 1 Column: (*))
>         |   |   |
>         |   |   (Name: Cast Type: float Uid: 106)
>         |   |   |
>         |   |   |---gpr:(Name: Project Type: bytearray Uid: 106 Input: 2 Column: (*))
>         |   |
>         |   |---(Name: LOInnerLoad[0] Schema: name#104:bytearray)
>         |   |
>         |   |---(Name: LOInnerLoad[1] Schema: age#105:bytearray)
>         |   |
>         |   |---(Name: LOInnerLoad[2] Schema: gpr#106:bytearray)
>         |
>         |---A: (Name: LOLoad Schema: name#104:bytearray,age#105:bytearray,gpr#106:bytearray)RequiredFields:null
> {code}
>  



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