SQL functions are case sensitive

[ukclivecox]

Describe the bug

The count function in SQL is case sensitive and COUNT fails. But SQL functions are generally considered to be case-insensitive.

To Reproduce

import datetime

df = daft.from_pydict(
    {
        "integers": [1, 2, 3, 4],
        "floats": [1.5, 2.5, 3.5, 4.5],
        "bools": [True, True, False, False],
        "strings": ["a", "b", "c", "d"],
        "bytes": [b"a", b"b", b"c", b"d"],
        "dates": [
            datetime.date(1994, 1, 1),
            datetime.date(1994, 1, 2),
            datetime.date(1994, 1, 3),
            datetime.date(1994, 1, 4),
        ],
        "lists": [[1, 1, 1], [2, 2, 2], [3, 3, 3], [4, 4, 4]],
        "nulls": [None, None, None, None],
    }
)

df = daft.sql("SELECT COUNT(*) FROM df").show()

This causes an exception

InvalidSQLException: Unsupported SQL: 'Function `COUNT` not found'

Expected behavior

Both count(*) and COUNT(*) should work.

Component(s)

SQL

Additional context

Version 0.3.8