ERROR no plpy.Error defination

[BaiShaoqi]

Expected behavior

ERROR:  plpy.Error: boom (plpython.c:4960)
CONTEXT:  Traceback (most recent call last):
  PL/Python function "nested_error_raise", line 10, in <module>
    fun3()
  PL/Python function "nested_error_raise", line 8, in fun3
    fun2()
  PL/Python function "nested_error_raise", line 5, in fun2
    fun1()
  PL/Python function "nested_error_raise", line 2, in fun1
    raise plpy.Error("boom")
PL/Python function "nested_error_raise"

Actual behavior

ERROR:  PL/Container client exception occurred:
DETAIL:
 Exception occurred in Python during function execution
 Traceback (most recent call last):
  File "<string>", line 13, in nested_error_raise
  File "<string>", line 11, in fun3
  File "<string>", line 8, in fun2
  File "<string>", line 5, in fun1
AttributeError: 'module' object has no attribute 'Error'

Step to reproduce the behavior

CREATE FUNCTION nested_error_raise() RETURNS text
AS $$
# container: plc_python_shared
def fun1():
    raise plpy.Error("boom")

def fun2():
    fun1()

def fun3():
    fun2()

fun3()
return "not reached"
$$ LANGUAGE plcontainer;

SELECT nested_error_raise();

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