SingleStore Helios needs explicit ROWSTORE for global temp tables

TL;DR

On Helios, always write CREATE ROWSTORE GLOBAL TEMPORARY TABLE for temp tables; plain CREATE GLOBAL TEMPORARY TABLE fails because columnstore does not support it.

Steps

1. On Helios, always write CREATE ROWSTORE GLOBAL TEMPORARY TABLE for temp tables; plain CREATE GLOBAL TEMPORARY TABLE fails because columnstore does not support it. For regular tables, spell out ROWSTORE or COLUMNSTORE explicitly rather than trusting the default, since the default is locked to columnstore on Helios and differs on self-managed.

When to use

You are seeing this: For regular tables, spell out ROWSTORE or COLUMNSTORE explicitly rather than trusting the default, since the default is locked to columnstore on Helios and differs on self-managed. Use this skill when you run into "SingleStore Helios needs explicit ROWSTORE for global temp tables".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Source: Official docs (CREATE TABLE reference): documents the gotcha that on SingleStore Helios the defaulttabletype engine variable is set to columnstore and cannot be changed, so plain CREATE TABLE always makes columnstore. Worse, GLOBAL TEMPORARY is not supported on columnstore tables at all, so agents creating temp tables with default syntax get an error instead of a table.

Verified resolution: On Helios, always write CREATE ROWSTORE GLOBAL TEMPORARY TABLE for temp tables; plain CREATE GLOBAL TEMPORARY TABLE fails because columnstore does not support it. For regular tables, spell out ROWSTORE or COLUMNSTORE explicitly rather than trusting the default, since the default is locked to columnstore on Helios and differs on self-managed.

Source URL: https://docs.singlestore.com/cloud/reference/sql-reference/data-definition-language-ddl/create-table/