Columns with capital letters in DataFusion

[riziles]

Just memorializing this here in case anybody else comes across this issue. Will try to submit a PR to docs when I have time.

DataFusion is throwing a "FieldNotFound" error when the column is definitely there.

[riziles]

Set datafusion.sql_parser.enable_ident_normalization to "false".

from datafusion import SessionConfig, SessionContext
from deltalake import DeltaTable

cfg = SessionConfig().set("datafusion.sql_parser.enable_ident_normalization", "false")

ctx = SessionContext(cfg)

ctx.register_table_provider("data", DeltaTable("msr_data"))

ctx.sql("select CutoffDate from data limit 10").show()