Add Apache Drill Dialect to SqlGlot

[cgivre]

This PR adds a dialect for Apache Drill to SQLGlot.

Remaining work:

• Add support for Drill table() function
• Add unit tests for table() function.

[tobymao]

why did you add varbinary? that's already a type

[cgivre]

Removed. Drill doesn't have a BINARY data type, just a VARBINARY, so that's what I was trying to do here, but I think that is covered elsewhere.

[tobymao]

then it should instead be in the generator binary mapping to varbinary, look at what presto does

[cgivre]

Gotcha.... and it's already there. 👍

sqlglot/sqlglot/dialects/drill.py

Lines 129 to 132 in f1f4fa2

	exp.DataType.Type.SMALLINT: "INTEGER",
	exp.DataType.Type.TINYINT: "INTEGER",
	exp.DataType.Type.BINARY: "VARBINARY",
	exp.DataType.Type.TEXT: "VARCHAR",

[tobymao]

this is a pretty good start, why don't we get this merged in and then fix the xlsx table afterwards?

[cgivre]

this is a pretty good start, why don't we get this merged in and then fix the xlsx table afterwards?

@tobymao I'd defer to you on that. Drill's SQL dialect follows ANSI 2003 pretty closely, so I don't anticipate there's much more do to. I'm happy to proceed if that's what you think is best. Going to sleep now, but tomorrow, I'll remove the unit test for the table() function.

[tobymao]

ok yea, let's just get this merged. it's nice and clean. the table function is going to be much harder