old_contents: from pypika import MySQLQuery, Order, PostgreSQLQuery, terms
  from pypika.dialects import MySQLQueryBuilder, PostgreSQLQueryBuilder
  from pypika.queries import QueryBuilder, Schema, Table
  from pypika.terms import Function
  
  from frappe.query_builder.terms import ParameterizedValueWrapper
  from frappe.utils import get_table_name
  
  
  class Base:
  	terms = terms
  	desc = Order.desc
  	Schema = Schema
  	Table = Table
  
  	@staticmethod
  	def functions(name: str, *args, **kwargs) -> Function:
  		return Function(name, *args, **kwargs)
  
  	@staticmethod
  	def DocType(table_name: str, *args, **kwargs) -> Table:
  		table_name = get_table_name(table_name)
  		return Table(table_name, *args, **kwargs)
  
  	@classmethod
  	def into(cls, table, *args, **kwargs) -> QueryBuilder:
  		if isinstance(table, str):
  			table = cls.DocType(table)
  		return super().into(table, *args, **kwargs)
  
  	@classmethod
  	def update(cls, table, *args, **kwargs) -> QueryBuilder:
  		if isinstance(table, str):
  			table = cls.DocType(table)
  		return super().update(table, *args, **kwargs)
  
  
  class MariaDB(Base, MySQLQuery):
  	Field = terms.Field
  
  	@classmethod
  	def _builder(cls, *args, **kwargs) -> "MySQLQueryBuilder":
  		return super()._builder(*args, wrapper_cls=ParameterizedValueWrapper, **kwargs)
  
  	@classmethod
  	def from_(cls, table, *args, **kwargs):
  		if isinstance(table, str):
  			table = cls.DocType(table)
  		return super().from_(table, *args, **kwargs)
  
  
  class Postgres(Base, PostgreSQLQuery):
  	field_translation = {"table_name": "relname", "table_rows": "n_tup_ins"}
  	schema_translation = {"tables": "pg_stat_all_tables"}
  	# TODO: Find a better way to do this
  	# These are interdependent query changes that need fixing. These
  	# translations happen in the same query. But there is no check to see if
  	# the Fields are changed only when a particular `information_schema` schema
  	# is used. Replacing them is not straightforward because the "from_"
  	# function can not see the arguments passed to the "select" function as
  	# they are two different objects. The quick fix used here is to replace the
  	# Field names in the "Field" function.
  
  	@classmethod
  	def _builder(cls, *args, **kwargs) -> "PostgreSQLQueryBuilder":
  		return super()._builder(*args, wrapper_cls=ParameterizedValueWrapper, **kwargs)
  
  	@classmethod
  	def Field(cls, field_name, *args, **kwargs):
  		if field_name in cls.field_translation:
  			field_name = cls.field_translation[field_name]
  		return terms.Field(field_name, *args, **kwargs)
  
  	@classmethod
  	def from_(cls, table, *args, **kwargs):
  		if isinstance(table, Table):
  			if table._schema:
  				if table._schema._name == "information_schema":
  					table = cls.schema_translation[table._table_name]
  
  		elif isinstance(table, str):
  			table = cls.DocType(table)
  
  		return super().from_(table, *args, **kwargs)
  
new_contents: from pypika import MySQLQuery, Order, PostgreSQLQuery, terms
  from pypika.dialects import MySQLQueryBuilder, PostgreSQLQueryBuilder
  from pypika.queries import QueryBuilder, Schema, Table
  from pypika.terms import Function
  
  from frappe.query_builder.terms import ParameterizedValueWrapper
  from frappe.utils import get_table_name
  
  
  class Base:
  	terms = terms
  	desc = Order.desc
  	Schema = Schema
  	Table = Table
  
  	@staticmethod
  	def functions(name: str, *args, **kwargs) -> Function:
  		return Function(name, *args, **kwargs)
  
  	@staticmethod
  	def DocType(table_name: str, *args, **kwargs) -> Table:
  		table_name = get_table_name(table_name)
  		return Table(table_name, *args, **kwargs)
  
  	@classmethod
  	def into(cls, table, *args, **kwargs) -> QueryBuilder:
  		if isinstance(table, str):
  			table = cls.DocType(table)
  		return super().into(table, *args, **kwargs)
  
  	@classmethod
  	def update(cls, table, *args, **kwargs) -> QueryBuilder:
  		if isinstance(table, str):
  			table = cls.DocType(table)
  		return super().update(table, *args, **kwargs)
  
  
  class MariaDB(Base, MySQLQuery):
  	Field = terms.Field
  
  	@classmethod
  	def _builder(cls, *args, **kwargs) -> "MySQLQueryBuilder":
  		return super()._builder(*args, wrapper_cls=ParameterizedValueWrapper, **kwargs)
  
  	@classmethod
  	def from_(cls, table, *args, **kwargs):
  		if isinstance(table, str):
  			table = cls.DocType(table)
  		return super().from_(table, *args, **kwargs)
  
  
  class Postgres(Base, PostgreSQLQuery):
  	field_translation = {"table_name": "relname", "table_rows": "n_tup_ins"}
  	schema_translation = {"tables": "pg_stat_all_tables"}
  	# TODO: Find a better way to do this
  	# These are interdependent query changes that need fixing. These
  	# translations happen in the same query. But there is no check to see if
  	# the Fields are changed only when a particular `information_schema` schema
  	# is used. Replacing them is not straightforward because the "from_"
  	# function can not see the arguments passed to the "select" function as
  	# they are two different objects. The quick fix used here is to replace the
  	# Field names in the "Field" function.
  
  	@classmethod
  	def _builder(cls, *args, **kwargs) -> "PostgreSQLQueryBuilder":
  		return super()._builder(*args, wrapper_cls=ParameterizedValueWrapper, **kwargs)
  
  	@classmethod
  	def Field(cls, field_name, *args, **kwargs):
  		if field_name in cls.field_translation:
  			field_name = cls.field_translation[field_name]
  		return terms.Field(field_name, *args, **kwargs)
  
  	@classmethod
  	def from_(cls, table, *args, **kwargs):
  		if isinstance(table, Table):
  			if table._schema:
  				if table._schema._name == "information_schema":
  					table = cls.schema_translation.get(table._table_name) or table
  
  		elif isinstance(table, str):
  			table = cls.DocType(table)
  
  		return super().from_(table, *args, **kwargs)
  
subject: Use fallback og table if not found in schema mapper