Min max added to reduction ops

doc/source/whatsnew/v2.0.0.rst

@@ -1016,6 +1016,7 @@ Numeric
 - Bug in DataFrame reduction methods (e.g. :meth:`DataFrame.sum`) with object dtype, ``axis=1`` and ``numeric_only=False`` would not be coerced to float (:issue:`49551`)
 - Bug in :meth:`DataFrame.sem` and :meth:`Series.sem` where an erroneous ``TypeError`` would always raise when using data backed by an :class:`ArrowDtype` (:issue:`49759`)
 - Bug in :meth:`Series.__add__` casting to object for list and masked :class:`Series` (:issue:`22962`)
+- Bug in :meth:`query` with ``engine="numexpr"`` and column names are ``min`` or ``max``, does not work correctly (:issue:`50937`)
 
 Conversion
 ^^^^^^^^^^

pandas/core/computation/ops.py

@@ -35,7 +35,7 @@
     pprint_thing_encoded,
 )
 
-REDUCTIONS = ("sum", "prod")
+REDUCTIONS = ("sum", "prod", "min", "max")
 
 _unary_math_ops = (
     "sin",

pandas/tests/frame/test_query_eval.py

@@ -3,7 +3,10 @@
 import numpy as np
 import pytest
 
-from pandas.errors import UndefinedVariableError
+from pandas.errors import (
+    NumExprClobberingError,
+    UndefinedVariableError,
+)
 import pandas.util._test_decorators as td
 
 import pandas as pd
@@ -864,6 +867,22 @@ def test_nested_scope(self):
         )
         tm.assert_frame_equal(expected, result)
 
+    def test_query_numexpr_with_min_and_max_columns(self):
+        df = DataFrame({"min": [1, 2, 3], "max": [4, 5, 6]})
+        regex_to_match = (
+            r"Variables in expression \"\(min\) == \(1\)\" "
+            r"overlap with builtins: \('min'\)"
+        )
+        with pytest.raises(NumExprClobberingError, match=regex_to_match):
+            df.query("min == 1")
+
+        regex_to_match = (
+            r"Variables in expression \"\(max\) == \(1\)\" "
+            r"overlap with builtins: \('max'\)"
+        )
+        with pytest.raises(NumExprClobberingError, match=regex_to_match):
+            df.query("max == 1")
+
 
 class TestDataFrameQueryPythonPandas(TestDataFrameQueryNumExprPandas):
     @classmethod