It represents a Unicode code but you have to use decimal ASCII code, for example, '\u0010' definition is converted to '\000a' Hive table field delimiter. Hex has '\u' prefix and includes 4 digits. Octal starts from back slash and contains 3 digits, for example, '\001'.
The rules to assign a filed delimiter are. If you need to use the extended ASCII character from 128 to 255 codes, it should be used other SerDe classes, for example,. Characters of the first part of ASCII table with codes from 0 to 127 are only accepted as field delimiters. Java char data type can understand both ASCII and Unicode characters but it can handle Unicode characters which belong to ASCII table. The main issue with field delimiter is that Java char data type is used as an argument to assign a field delimiter. OpenCSVSerde has a limitation to handle only string data type in Hive tables. LazySimpleSerDe is more efficient in terms of performance. .serde2.OpenCSVSerdeThe default field delimiter value is ','.The default field delimiter value is '\001'. serde2 is the Hive SerDe library including TEXTFILE formats. SerDe defines input/output (IO) interface which handles: (1) read data from a Hive table and (2) write it back out to HDFS.
There are 2 major SerDe (Serializer/Deserializer) classes for text data. Also, it's critical to know a default field delimiter if field delimiter setting is missed in a create statement. When a field delimiter is not assigned properly, Hive can't split data into columns, and as a result, the first column will contain all data and the rest of columns will have NULL values. This setting is requested for delimited text files placed as source of Hive tables.
#Hex fiend line delimiter how to
Not too much official documentation can be found on how to define a field delimiter in a create or an alter Apache Hive statement.
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