Help Center/ MapReduce Service/ Component Operation Guide (Normal)/ Using Loader/ Operator Help/ Conversion Operators/ String Operations
Updated on 2026-06-27 GMT+08:00
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String Operations

Overview

The String Operations operator converts the upper and lower cases of existing fields to generate new fields.

Input and Output

  • Input: fields whose case is to be converted
  • Output: new fields after conversion

Parameter Description

Table 1 Operator parameter description

Parameter

Description

Type

Mandatory

Default Value

Fields to be processed

Information about fields for string case conversion:

  • input field name: Names of input fields. Set this parameter to the names of fields generated in the previous conversion step.
  • output field name: Names of output fields.
  • lower/upper: Indicates whether data is to be converted into uppercase letters or lowercase letters.

map

Yes

None

Data Processing Rule

  • Case conversion is performed for strings.
  • If the input data is null, no case conversion is performed.

Example

Use the CSV File Input operator to generate fields A and B.

The following figure shows the source file.

abcd,product
FusionInsight,Bigdata

After configuring the String Operations operator, fields C and D are generated.

After conversion, four fields are generated, as shown in the following figure.

abcd,product,ABCD,product
FusionInsight,Bigdata,FUSIONINSIGHT,bigdata
Parent topic: Conversion Operators