[BUG] Big decimal literal is not supported with Calcite

**What is the bug?**
Calcite cannot handle big decimal literal correctly.

**How can one reproduce the bug?**
```
POST _plugins/_ppl/
{
  "query": """
source=time | eval `FLOOR(9223372036854775807.0000001)` = FLOOR(9223372036854775807.0000001) | fields `FLOOR(9223372036854775807.0000001)`
  """
}
```
throw assert error

**What is the expected behavior?**
Above query should pass
