From b22e45810866f874bf36b082bdb866cfe9614b40 Mon Sep 17 00:00:00 2001
From: Yongjie Zhao <yongjie.zhao@gmail.com>
Date: Wed, 13 Jan 2021 23:25:58 +0800
Subject: [PATCH] fix(timepicker): make pyparsing thread safe (#12489)

* fix: make pyparsing thread safe

* remove parenthesis for decorator
---
 superset/utils/date_parser.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/superset/utils/date_parser.py b/superset/utils/date_parser.py
index aee2c83a0d..bd979f3c07 100644
--- a/superset/utils/date_parser.py
+++ b/superset/utils/date_parser.py
@@ -32,6 +32,7 @@ from pyparsing import (
     Group,
     Optional as ppOptional,
     ParseException,
+    ParserElement,
     ParseResults,
     pyparsing_common,
     quotedString,
@@ -40,6 +41,8 @@ from pyparsing import (
 
 from .core import memoized
 
+ParserElement.enablePackrat()
+
 logger = logging.getLogger(__name__)
 
 
@@ -375,7 +378,7 @@ class EvalHolidayFunc:  # pylint: disable=too-few-public-methods
         raise ValueError(_("Unable to find such a holiday: [{}]").format(holiday))
 
 
-@memoized()
+@memoized
 def datetime_parser() -> ParseResults:  # pylint: disable=too-many-locals
     (  # pylint: disable=invalid-name
         DATETIME,