Bug #119139 Unexpected error `Incorrect DECIMAL value: '0' for column '' at row -1`

Description:
Hi,

The following test case triggers an unexpected error:

```
CREATE TABLE IF NOT EXISTS t0(c0 DECIMAL) ;
INSERT INTO t0(c0) VALUES(1);
CREATE INDEX i0 ON t0(((LEAST("", 1)) > (t0.c0))); -- Incorrect DECIMAL value: '0' for column '' at row -1
```

How to repeat:
```
CREATE TABLE IF NOT EXISTS t0(c0 DECIMAL) ;
INSERT INTO t0(c0) VALUES(1);
CREATE INDEX i0 ON t0(((LEAST("", 1)) > (t0.c0)));
```

I find the following DELETE can also trigger this error:
```
CREATE TABLE IF NOT EXISTS t0(c0 DECIMAL);
INSERT INTO t0(c0) VALUES(1);
PREPARE prepare_query FROM 'DELETE LOW_PRIORITY QUICK FROM t0 WHERE (LEAST("", "")) IN (GREATEST(t0.c0, CAST(-1 AS DECIMAL)))';
EXECUTE prepare_query;
```

Thank you for your bug report.
Verified as described.