Create/insert with case-sensitive table name success, but not found while select.

[Rachelint]

Describe this problem

Create/insert a table named like "DeMo" will success.
But when I select something in this table, error of "table not found" will be returned.

Steps to reproduce

• Create table:

CREATE TABLE DeMo (
    `timestamp` timestamp NOT NULL,
    `arch` string TAG,
    `datacenter` string TAG,
    `value` int,
    timestamp KEY (timestamp)) ENGINE=Analytic
WITH(
	 enable_ttl='false'
);

• Insert something:

INSERT INTO DeMo
    (`timestamp`, `arch`, `datacenter`, `value`)
VALUES
    (1658304762, 'x86-64', 'china', 100),

• Select something:

SELECT * FROM DeMo;

Expected behavior

No response

Additional Information

No response

[ShiKaiWi]

😵‍💫

[Rachelint]

😵‍💫

I think we can only support case-insensitive now?

[ShiKaiWi]

This reference says whether the identifiers are case-sensitive depends on the OS because of the mysql implementation. And there is no a worry for CeresDB's implementation, so let's make all the identifiers case-sensitive.

[ShiKaiWi]

This 'bug' is introduced by apache/datafusion#1746.

Maybe this is not a bug, and just quote the ident by ` if we want to make the table names case sensitive:

SELECT * FROM DeMo;

[jiacai2050]

Yeah, it's a feature, not bug. I think we should:

• Add a testcase
• Update document, https://docs.ceresdb.io/sql/identifier.html