chore: revert datatypes changes

ibis/backends/base/sqlglot/datatypes.py

@@ -418,5 +418,26 @@ class OracleType(SqlglotType):
     dialect = "oracle"
 
 
+class SnowflakeType(SqlglotType):
+    dialect = "snowflake"
+    default_temporal_scale = 9
+
+    @classmethod
+    def _from_sqlglot_FLOAT(cls) -> dt.Float64:
+        return dt.Float64(nullable=cls.default_nullable)
+
+    @classmethod
+    def _from_sqlglot_DECIMAL(cls, precision=None, scale=None) -> dt.Decimal:
+        if scale is None or int(scale.this.this) == 0:
+            return dt.Int64(nullable=cls.default_nullable)
+        else:
+            return super()._from_sqlglot_DECIMAL(precision, scale)
+
+    @classmethod
+    def _from_sqlglot_ARRAY(cls, value_type=None) -> dt.Array:
+        assert value_type is None
+        return dt.Array(dt.json, nullable=cls.default_nullable)
+
+
 class SQLiteType(SqlglotType):
     dialect = "sqlite"