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blobexpansion drop-columns

  • Published on Aug 6, 2026
  • 1 minute(s) read
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This command removes (drops) fields from being parsed from Kafka events. The column in the target database table remains, and any data in the column for messages parsed prior to it being dropped remains. Parsing of subsequent messages will not include the dropped fields.

Usage

vcli: admin> blobexpansion drop-columns --database-name DATABASE
                                        --table-name TABLE 
                                        --arrow-schema ARROW_SCHEMA
                                       [--tenant-id TENANT]
                                       [--source-column-name SOURCE_COLUMN]
                                       [--remove-copy-source-column REMOVE_COPY_SOURCE]

Required Parameters

--database-name DATABASE

Kafka bucket name containing the source topic

--table-name TABLE

Source Kafka topic name

--arrow-schema ARROW_SCHEMA

Comma-separated list of fields of in the source of form name-type to discontinue parsing to the target,

Example --arrow-schema id,int, status-string

Options

--tenant-id TENANT

Tenant ID (optional)

--source-column-name SOURCE_COLUMN

Source column name (defaults to 'value')

--remove-copy-source-column

If set, discontinues copying the source json blob to the target table.

Example

This example shows the blobexpansion drop-columns command with sample values.

vcli: admin> blobexpansion drop-columns --tenant-id <integer> --database-name kafka_bucket --table-name my_topic --source-column-name value --arrow-schema col1-string,col2-int --remove-copy-source-column