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Impala and MultiDelimitSerDe

New Contributor

Hi,

 

    I've recently tried ran into an issue where we need to use multi delimited delimiter.

    In hive using the org.apache.hadoop.hive.contrib.serde2.MultiDelimitSerDe serde works great.

 

    Data Sample:

mandt,description,systemid
090,no comma 01,10
090,this is a, test,10
090,we can see~1,d,10
090,comma,commacomma,,10
090,no comma 02,10

 

  Table created :

  

CREATE EXTERNAL TABLE `amt_multi`(
  `mandt` varchar(3) COMMENT 'from deserializer', 
  `description` varchar(200) COMMENT 'from deserializer', 
  `systemid` int COMMENT 'from deserializer')
ROW FORMAT SERDE 
  'org.apache.hadoop.hive.contrib.serde2.MultiDelimitSerDe' 
WITH SERDEPROPERTIES ( 
  'field.delim'='<|>', 
  'line.delim'='/n') 
STORED AS INPUTFORMAT 
  'org.apache.hadoop.mapred.TextInputFormat' 
OUTPUTFORMAT 
  'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat'
LOCATION
  'hdfs://hdfsha1/DEV/Raw_STAGING/Stg_GIS/multi'
TBLPROPERTIES (
  'COLUMN_STATS_ACCURATE'='false', 
  'numFiles'='0', 
  'numRows'='-1', 
  'rawDataSize'='-1', 
  'skip.header.line.count'='1', 
  'totalSize'='0', 
  'transient_lastDdlTime'='1503183208')

 

    but when quering this same table from Impala, impala throws an error : 

    

  • AnalysisException: Failed to load metadata for table: 'amt_multi' CAUSED BY: TableLoadingException: Failed to load metadata for table: amt_multi CAUSED BY: InvalidStorageDescriptorException: Invalid delimiter: '<|>'. Delimiter must be specified as a single character or as a decimal value in the range [-128:127]

 

 So my question is can impala support multi character delimiter for text type data ? And if so how 

 does one do this.

 

Thanks

1 REPLY 1

Expert Contributor

Hi,

I have tested the same in my lab cluster, seems to be multi character delimiters will not works in impala.

 

Below is my testing when i tried with ',|'

 

Failing:

Query: Create table test ( name string, place string ) ROW FORMAT DELIMITED FIELDS TERMINATED BY ',|'

STORED AS TEXTFILE

TBLPROPERTIES('serialization.null.format'='')

ERROR: AnalysisException: ESCAPED BY values and LINE/FIELD terminators must be specified as a single character or as a decimal value in the range [-128:127]: ,|

 

Created:

[host-1abc.cloudera.com:21000] default> Create table test ( name string, place string ) ROW FORMAT DELIMITED FIELDS TERMINATED BY '|'

                                                  > STORED AS TEXTFILE

                                                  > TBLPROPERTIES('serialization.null.format'='');

Query: Create table test ( name string, place string ) ROW FORMAT DELIMITED FIELDS TERMINATED BY '|'

STORED AS TEXTFILE

TBLPROPERTIES('serialization.null.format'='')

+-------------------------+

| summary                 |

+-------------------------+

| Table has been created. |

+-------------------------+

 

Created:

[host-1abc.cloudera.com:21000] default> Create table test1 ( name string, place string ) ROW FORMAT DELIMITED FIELDS TERMINATED BY ','

                                                  > STORED AS TEXTFILE

                                                  > TBLPROPERTIES('serialization.null.format'='');

Query: Create table test1 ( name string, place string ) ROW FORMAT DELIMITED FIELDS TERMINATED BY ','

STORED AS TEXTFILE

TBLPROPERTIES('serialization.null.format'='')

+-------------------------+

| summary                 |

+-------------------------+

| Table has been created. |

+-------------------------+

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