def ptr_default_to_col_default(schema, ptr, expr):
try:
# NOTE: This code currently will only be invoked for scalars.
# Blindly cast the default expression into the ptr target
# type, validation of the expression type is not the concern
# of this function.
eql = ql_parser.parse(expr.text)
eql = ql_astutils.ensure_qlstmt(
qlast.TypeCast(
type=s_utils.typeref_to_ast(schema, ptr.get_target(schema)),
expr=eql,
))
ir = qlcompiler.compile_ast_to_ir(eql, schema)
except errors.SchemaError:
# Reference errors mean that is is a non-constant default
# referring to a not-yet-existing objects.
return None
if not ir_utils.is_const(ir):
return None
sql_expr = compiler.compile_ir_to_sql_tree(ir, singleton_mode=True)
sql_text = codegen.SQLSourceGenerator.to_source(sql_expr)
return sql_text
def type_to_ql_typeref(
t: s_types.Type,
*,
_name: Optional[str] = None,
ctx: context.ContextLevel,
) -> qlast.TypeExpr:
return s_utils.typeref_to_ast(
ctx.env.schema,
t,
disambiguate_std='std' in ctx.modaliases,
)
def type_to_ql_typeref(t: s_types.Type, *,
schema: s_schema.Schema) -> qlast.TypeExpr:
return s_utils.typeref_to_ast(schema, t)
