diff --git a/partiql-parser/src/lexer.rs b/partiql-parser/src/lexer.rs
index 8785f755..c3367a50 100644
--- a/partiql-parser/src/lexer.rs
+++ b/partiql-parser/src/lexer.rs
@@ -1126,6 +1126,43 @@ mod tests {
         Ok(())
     }
 
+    /// In the future, the following identifiers may be converted into reserved keywords. In that case,
+    /// the following test will need to be modified.
+    #[test]
+    fn select_non_reserved_keywords() -> Result<(), ParseError<'static, BytePosition>> {
+        let query =
+            "SELECT acyclic, BoTh, DOMAIN, SiMpLe, Trail, leading, TRailing, USER\nfrom @\"foo\"";
+        let mut offset_tracker = LineOffsetTracker::default();
+        let lexer = PartiqlLexer::new(query, &mut offset_tracker);
+        let toks: Vec<_> = lexer.collect::<Result<_, _>>()?;
+
+        assert_eq!(
+            vec![
+                Token::Select,
+                Token::UnquotedIdent("acyclic"),
+                Token::Comma,
+                Token::UnquotedIdent("BoTh"),
+                Token::Comma,
+                Token::UnquotedIdent("DOMAIN"),
+                Token::Comma,
+                Token::UnquotedIdent("SiMpLe"),
+                Token::Comma,
+                Token::UnquotedIdent("Trail"),
+                Token::Comma,
+                Token::UnquotedIdent("leading"),
+                Token::Comma,
+                Token::UnquotedIdent("TRailing"),
+                Token::Comma,
+                Token::UnquotedIdent("USER"),
+                Token::From,
+                Token::QuotedAtIdentifier("foo"),
+            ],
+            toks.into_iter().map(|(_s, t, _e)| t).collect::<Vec<_>>()
+        );
+        assert_eq!(offset_tracker.num_lines(), 2);
+        Ok(())
+    }
+
     #[test]
     fn err_invalid_input() {
         let query = "SELECT # FROM data GROUP BY a";
diff --git a/partiql-parser/src/parse/mod.rs b/partiql-parser/src/parse/mod.rs
index d34f4ddf..0e430217 100644
--- a/partiql-parser/src/parse/mod.rs
+++ b/partiql-parser/src/parse/mod.rs
@@ -679,6 +679,48 @@ mod tests {
         }
     }
 
+    /// In the future, the following identifiers may be converted into reserved keywords. In that case,
+    /// the following tests will need to be modified.
+    mod non_reserved_keywords {
+        use super::*;
+
+        #[test]
+        fn projection_list_trim_spec() {
+            parse!(r#"SELECT leading FROM t"#);
+            parse!(r#"SELECT leading, a FROM t"#);
+            parse!(r#"SELECT leading + trailing, b FROM t"#);
+            parse!(r#"SELECT both + leading + trailing, a, b, c FROM t"#);
+        }
+
+        #[test]
+        fn from_source_trim_spec() {
+            parse!(r#"SELECT leading, trailing, both FROM leading, trailing, both"#);
+        }
+
+        #[test]
+        fn complex_trim() {
+            parse!(
+                r#"SELECT leading + trim(leading leading FROM '  hello world'), both FROM leading, trailing, both"#
+            );
+        }
+
+        #[test]
+        fn graph_pattern_matching() {
+            parse!(r#"SELECT acyclic, trail, simple FROM t"#);
+            parse!(r#"AcYcLiC"#);
+            parse!(r#"TrAiL"#);
+            parse!(r#"SiMpLe"#);
+        }
+
+        #[test]
+        fn user_public_domain() {
+            parse!(r#"SELECT user, puBlIC, DOMAIN FROM USER, pUbLIc, domain"#);
+            parse!(r#"USER"#);
+            parse!(r#"pUbLIC"#);
+            parse!(r#"domain"#);
+        }
+    }
+
     mod errors {
         use super::*;
         use crate::error::{LexError, UnexpectedToken, UnexpectedTokenData};
diff --git a/partiql-parser/src/preprocessor.rs b/partiql-parser/src/preprocessor.rs
index 9e31ba3a..ffe8a1cc 100644
--- a/partiql-parser/src/preprocessor.rs
+++ b/partiql-parser/src/preprocessor.rs
@@ -706,10 +706,45 @@ mod tests {
             preprocess(r#"trim(LEADING 'Foo' from 'FooBar')"#)?,
             lex(r#"trim(LEADING : 'Foo', "from" : 'FooBar')"#)?
         );
+
+        // Trim Specification in all 3 spots
+        assert_eq!(
+            preprocess(r#"trim(BOTH TrAiLiNg from TRAILING)"#)?,
+            lex(r#"trim(BOTH : TrAiLiNg, "from" : TRAILING)"#)?
+        );
+
+        // Trim specification in 1st and 2nd spot
+        assert_eq!(
+            preprocess(r#"trim(LEADING LEADING from 'FooBar')"#)?,
+            lex(r#"trim(LEADING : LEADING, "from" : 'FooBar')"#)?
+        );
+        assert_eq!(
+            preprocess(r#"trim(LEADING TrAiLiNg from 'FooBar')"#)?,
+            lex(r#"trim(LEADING : TrAiLiNg, "from" : 'FooBar')"#)?
+        );
+        assert_eq!(
+            preprocess(r#"trim(tRaIlInG TrAiLiNg from 'FooBar')"#)?,
+            lex(r#"trim(tRaIlInG : TrAiLiNg, "from" : 'FooBar')"#)?
+        );
+
+        // Trim specification in 1st and 3rd spot
         assert_eq!(
             preprocess(r#"trim(LEADING 'Foo' from leaDing)"#)?,
             lex(r#"trim(LEADING : 'Foo', "from" : leaDing)"#)?
         );
+
+        // Trim Specification (quoted) in 2nd and 3rd spot
+        assert_eq!(
+            preprocess(r#"trim('LEADING' from leaDing)"#)?,
+            lex(r#"trim('LEADING', "from" : leaDing)"#)?
+        );
+
+        // Trim Specification in 3rd spot only
+        assert_eq!(
+            preprocess(r#"trim('a' from leaDing)"#)?,
+            lex(r#"trim('a', "from" : leaDing)"#)?
+        );
+
         assert_eq!(
             preprocess(r#"trim(leading from '   Bar')"#)?,
             lex(r#"trim(leading : ' ',  "from" : '   Bar')"#)?