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DROP DATABASE IF EXISTS `mcol_4758`;
CREATE DATABASE `mcol_4758`;
USE `mcol_4758`;
CREATE TABLE src (c0 INT, cLB LONGBLOB, cLT LONGTEXT)engine=columnstore default charset utf8mb4;
SELECT column_name, data_type, column_length FROM information_schema.columnstore_columns WHERE hex(table_schema)=hex('mcol_4758') and hex(table_name)=hex('src');
column_name data_type column_length
c0 int 4
clb blob 16777215
clt text 16777215
INSERT INTO src VALUES (1, "Pretty Bloby Thing", "This is some text");
select * from src where c0=1 and substr(cLT, 1, 4)="This";
c0 cLB cLT
1 Pretty Bloby Thing This is some text
ALTER TABLE src ADD COLUMN (cLT2 LONGTEXT);
UPDATE src SET cLT2="My Friday Night" where c0=1;
select * from src where c0=1 and substr(cLT, 1, 4)="This";
c0 cLB cLT cLT2
1 Pretty Bloby Thing This is some text My Friday Night
DROP DATABASE `mcol_4758`;