1 files changed, 29 insertions, 12 deletions
diff --git a/sqlglot/expressions.py b/sqlglot/expressions.py
index f4aae47..9011dce 100644
--- a/sqlglot/expressions.py
+++ b/sqlglot/expressions.py
@@ -948,12 +948,17 @@ class Column(Condition):
         return Dot.build(parts)
 
 
+class ColumnPosition(Expression):
+    arg_types = {"this": False, "position": True}
+
+
 class ColumnDef(Expression):
     arg_types = {
         "this": True,
         "kind": False,
         "constraints": False,
         "exists": False,
+        "position": False,
     }
 
 
@@ -3290,6 +3295,13 @@ class Anonymous(Func):
     is_var_len_args = True
 
 
+# https://docs.snowflake.com/en/sql-reference/functions/hll
+# https://docs.aws.amazon.com/redshift/latest/dg/r_HLL_function.html
+class Hll(AggFunc):
+    arg_types = {"this": True, "expressions": False}
+    is_var_len_args = True
+
+
 class ApproxDistinct(AggFunc):
     arg_types = {"this": True, "accuracy": False}
 
@@ -3440,6 +3452,10 @@ class CurrentTimestamp(Func):
     arg_types = {"this": False}
 
 
+class CurrentUser(Func):
+    arg_types = {"this": False}
+
+
 class DateAdd(Func, TimeUnit):
     arg_types = {"this": True, "expression": True, "unit": False}
 
@@ -3647,6 +3663,11 @@ class JSONBExtractScalar(JSONExtract):
     _sql_names = ["JSONB_EXTRACT_SCALAR"]
 
 
+class JSONFormat(Func):
+    arg_types = {"this": False, "options": False}
+    _sql_names = ["JSON_FORMAT"]
+
+
 class Least(Func):
     arg_types = {"expressions": False}
     is_var_len_args = True
@@ -3703,14 +3724,9 @@ class VarMap(Func):
     is_var_len_args = True
 
 
-class Matches(Func):
-    """Oracle/Snowflake decode.
-    https://docs.oracle.com/cd/B19306_01/server.102/b14200/functions040.htm
-    Pattern matching MATCHES(value, search1, result1, ...searchN, resultN, else)
-    """
-
-    arg_types = {"this": True, "expressions": True}
-    is_var_len_args = True
+# https://dev.mysql.com/doc/refman/8.0/en/fulltext-search.html
+class MatchAgainst(Func):
+    arg_types = {"this": True, "expressions": True, "modifier": False}
 
 
 class Max(AggFunc):
@@ -4989,9 +5005,10 @@ def replace_placeholders(expression, *args, **kwargs):
     Examples:
         >>> from sqlglot import exp, parse_one
         >>> replace_placeholders(
-        ...     parse_one("select * from :tbl where ? = ?"), "a", "b", tbl="foo"
+        ...     parse_one("select * from :tbl where ? = ?"),
+        ...     exp.to_identifier("str_col"), "b", tbl=exp.to_identifier("foo")
         ... ).sql()
-        'SELECT * FROM foo WHERE a = b'
+        "SELECT * FROM foo WHERE str_col = 'b'"
 
     Returns:
         The mapped expression.
@@ -5002,10 +5019,10 @@ def replace_placeholders(expression, *args, **kwargs):
             if node.name:
                 new_name = kwargs.get(node.name)
                 if new_name:
-                    return to_identifier(new_name)
+                    return convert(new_name)
             else:
                 try:
-                    return to_identifier(next(args))
+                    return convert(next(args))
                 except StopIteration:
                     pass
         return node