Merging upstream version 19.0.1.

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

1 files changed, 2 insertions, 7 deletions

diff --git a/sqlglot/dialects/presto.py b/sqlglot/dialects/presto.py
index aac368c..ded3655 100644
--- a/sqlglot/dialects/presto.py
+++ b/sqlglot/dialects/presto.py
@@ -36,7 +36,6 @@ def _approx_distinct_sql(self: Presto.Generator, expression: exp.ApproxDistinct)
 
 def _explode_to_unnest_sql(self: Presto.Generator, expression: exp.Lateral) -> str:
     if isinstance(expression.this, exp.Explode):
-        expression = expression.copy()
         return self.sql(
             exp.Join(
                 this=exp.Unnest(
@@ -72,7 +71,6 @@ def _schema_sql(self: Presto.Generator, expression: exp.Schema) -> str:
         for schema in expression.parent.find_all(exp.Schema):
             column_defs = schema.find_all(exp.ColumnDef)
             if column_defs and isinstance(schema.parent, exp.Property):
-                expression = expression.copy()
                 expression.expressions.extend(column_defs)
 
     return self.schema_sql(expression)
@@ -407,12 +405,10 @@ class Presto(Dialect):
                 target_type = None
 
             if target_type and target_type.is_type("timestamp"):
-                to = target_type.copy()
-
                 if target_type is start.to:
-                    end = exp.cast(end, to)
+                    end = exp.cast(end, target_type)
                 else:
-                    start = exp.cast(start, to)
+                    start = exp.cast(start, target_type)
 
             return self.func("SEQUENCE", start, end, step)
 
@@ -432,6 +428,5 @@ class Presto(Dialect):
             kind = expression.args["kind"]
             schema = expression.this
             if kind == "VIEW" and schema.expressions:
-                expression = expression.copy()
                 expression.this.set("expressions", None)
             return super().create_sql(expression)