Merging upstream version 6.2.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/sqlglot/generator.py b/sqlglot/generator.py
index a445178..d264e59 100644
--- a/sqlglot/generator.py
+++ b/sqlglot/generator.py
@@ -748,6 +748,9 @@ class Generator:
     def structkwarg_sql(self, expression):
         return f"{self.sql(expression, 'this')} {self.sql(expression, 'expression')}"
 
+    def parameter_sql(self, expression):
+        return f"@{self.sql(expression, 'this')}"
+
     def placeholder_sql(self, *_):
         return "?"
 
@@ -903,7 +906,7 @@ class Generator:
         return f"UNIQUE ({columns})"
 
     def if_sql(self, expression):
-        return self.case_sql(exp.Case(ifs=[expression], default=expression.args.get("false")))
+        return self.case_sql(exp.Case(ifs=[expression.copy()], default=expression.args.get("false")))
 
     def in_sql(self, expression):
         query = expression.args.get("query")