Adding upstream version 17.7.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

sqlglot/generator.py

@@ -164,6 +164,11 @@ class Generator:
     # https://cloud.google.com/bigquery/docs/reference/standard-sql/query-syntax
     SELECT_KINDS: t.Tuple[str, ...] = ("STRUCT", "VALUE")
 
+    # Whether or not VALUES statements can be used as derived tables.
+    # MySQL 5 and Redshift do not allow this, so when False, it will convert
+    # SELECT * VALUES into SELECT UNION
+    VALUES_AS_TABLE = True
+
     TYPE_MAPPING = {
         exp.DataType.Type.NCHAR: "CHAR",
         exp.DataType.Type.NVARCHAR: "VARCHAR",
@@ -260,8 +265,9 @@ class Generator:
 
     # Expressions whose comments are separated from them for better formatting
     WITH_SEPARATED_COMMENTS: t.Tuple[t.Type[exp.Expression], ...] = (
-        exp.Select,
+        exp.Drop,
         exp.From,
+        exp.Select,
         exp.Where,
         exp.With,
     )
@@ -818,7 +824,11 @@ class Generator:
 
     def datatype_sql(self, expression: exp.DataType) -> str:
         type_value = expression.this
-        type_sql = self.TYPE_MAPPING.get(type_value, type_value.value)
+        type_sql = (
+            self.TYPE_MAPPING.get(type_value, type_value.value)
+            if isinstance(type_value, exp.DataType.Type)
+            else type_value
+        )
         nested = ""
         interior = self.expressions(expression, flat=True)
         values = ""
@@ -1307,15 +1317,45 @@ class Generator:
         return self.prepend_ctes(expression, sql)
 
     def values_sql(self, expression: exp.Values) -> str:
-        args = self.expressions(expression)
-        alias = self.sql(expression, "alias")
-        values = f"VALUES{self.seg('')}{args}"
-        values = (
-            f"({values})"
-            if self.WRAP_DERIVED_VALUES and (alias or isinstance(expression.parent, exp.From))
-            else values
-        )
-        return f"{values} AS {alias}" if alias else values
+        # The VALUES clause is still valid in an `INSERT INTO ..` statement, for example
+        if self.VALUES_AS_TABLE or not expression.find_ancestor(exp.From, exp.Join):
+            args = self.expressions(expression)
+            alias = self.sql(expression, "alias")
+            values = f"VALUES{self.seg('')}{args}"
+            values = (
+                f"({values})"
+                if self.WRAP_DERIVED_VALUES and (alias or isinstance(expression.parent, exp.From))
+                else values
+            )
+            return f"{values} AS {alias}" if alias else values
+
+        # Converts `VALUES...` expression into a series of select unions.
+        # Note: If you have a lot of unions then this will result in a large number of recursive statements to
+        # evaluate the expression. You may need to increase `sys.setrecursionlimit` to run and it can also be
+        # very slow.
+        expression = expression.copy()
+        column_names = expression.alias and expression.args["alias"].columns
+
+        selects = []
+
+        for i, tup in enumerate(expression.expressions):
+            row = tup.expressions
+
+            if i == 0 and column_names:
+                row = [
+                    exp.alias_(value, column_name) for value, column_name in zip(row, column_names)
+                ]
+
+            selects.append(exp.Select(expressions=row))
+
+        subquery_expression: exp.Select | exp.Union = selects[0]
+        if len(selects) > 1:
+            for select in selects[1:]:
+                subquery_expression = exp.union(
+                    subquery_expression, select, distinct=False, copy=False
+                )
+
+        return self.subquery_sql(subquery_expression.subquery(expression.alias, copy=False))
 
     def var_sql(self, expression: exp.Var) -> str:
         return self.sql(expression, "this")
@@ -2043,7 +2083,7 @@ class Generator:
     def and_sql(self, expression: exp.And) -> str:
         return self.connector_sql(expression, "AND")
 
-    def xor_sql(self, expression: exp.And) -> str:
+    def xor_sql(self, expression: exp.Xor) -> str:
         return self.connector_sql(expression, "XOR")
 
     def connector_sql(self, expression: exp.Connector, op: str) -> str:
@@ -2507,6 +2547,21 @@ class Generator:
 
         return self.func("ANY_VALUE", this)
 
+    def querytransform_sql(self, expression: exp.QueryTransform) -> str:
+        transform = self.func("TRANSFORM", *expression.expressions)
+        row_format_before = self.sql(expression, "row_format_before")
+        row_format_before = f" {row_format_before}" if row_format_before else ""
+        record_writer = self.sql(expression, "record_writer")
+        record_writer = f" RECORDWRITER {record_writer}" if record_writer else ""
+        using = f" USING {self.sql(expression, 'command_script')}"
+        schema = self.sql(expression, "schema")
+        schema = f" AS {schema}" if schema else ""
+        row_format_after = self.sql(expression, "row_format_after")
+        row_format_after = f" {row_format_after}" if row_format_after else ""
+        record_reader = self.sql(expression, "record_reader")
+        record_reader = f" RECORDREADER {record_reader}" if record_reader else ""
+        return f"{transform}{row_format_before}{record_writer}{using}{schema}{row_format_after}{record_reader}"
+
 
 def cached_generator(
     cache: t.Optional[t.Dict[int, str]] = None