Hive table from CSV. The line termination in quotes

Question

I try to create table from CSV file which is save into HDFS. The problem is that the csv consist line break inside of quote. Example of record in CSV:

ID,PR_ID,SUMMARY
2063,1184,"This is problem field because consists line break

This is not new record but it is part of text of third column
"

I created hive table:

CREATE TEMPORARY EXTERNAL TABLE  hive_database.hive_table
(   
    ID STRING,
    PR_ID STRING,
    SUMMARY STRING 
)
row format serde 'com.bizo.hive.serde.csv.CSVSerde'
with serdeproperties (
    "separatorChar" = ",",
    "quoteChar"     = "\"",
    "escapeChar"  = "\""
)     
stored as textfile
LOCATION '/path/to/hdfs/dir/csv'
tblproperties('skip.header.line.count'='1');

Then I try to count the rows (The correct result should by 1)

Select count(*) from hive_database.hive_table;

But the result is 4 what is incorrect. Do you have any idea how to solve it? Thanks all.

Answer 1

There is right now no way to handle multilines csv in hive directly. However, there is some workaround:

1. produce a csv with \n or \r\n replaced with your own newline marker such <\br>. You will be able to load it in hive. Then transform the resulting text by replacing the latter by the former

2. use spark, it has a multiline csv reader. This works out the box, while the csv beeing not read in a distributed way.

   val df = spark.read
   .option("wholeFile", true)
   .option("multiline",true)
   .option("header", true)
   .option("inferSchema", "true")
   .option("dateFormat", "yyyy-MM-dd")
   .option("timestampFormat", "yyyy-MM-dd HH:mm:ss")
   .csv("test.csv")
   .write.format("orc")
   .saveAsTable("myschma.myTable")
   

3. use an other format such parquet, avro, orc, sequence file, instead of a csv. For example you could use sqoop to produce them from a jdbc database. Or you could write your own program in java or python.