Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/14599
The `L`, `S` & `Y` suffixes come from Hive.
The fix that is proposed by @petermaxlee has a potential problem when we
try parse something like `a-1`. This will be tokenized into an `IDENTIFIER` and
a `INTEGER_VALUE` instead of `IDENTIFIER` `MINUS` and a `INTEGER_VALUE`; the
first one will result in a `ParserException`. This is because the lexer applies
its rules in a greedy fashion.
This PR does not have this problem because it uses a parser rule, and we
can set presence there by ordering the rules (the sequence in which they are
defined). Here binary minus takes precedence over unary minus. We could add
this rule for the other dataTypes, but that is IMO merely a matter of
aesthetics.
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