Fix case sensetive bugs

Author: Peng Ren

pymongosql/__init__.py

@@ -6,7 +6,7 @@
 if TYPE_CHECKING:
     from .connection import Connection
 
-__version__: str = "0.4.6"
+__version__: str = "0.4.7"
 
 # Globals https://www.python.org/dev/peps/pep-0249/#globals
 apilevel: str = "2.0"

pymongosql/sql/handler.py

@@ -301,7 +301,7 @@ def _is_comparison_context(self, ctx: Any) -> bool:
     def _has_comparison_pattern(self, ctx: Any) -> bool:
         """Check if the expression text contains comparison patterns"""
         try:
-            text = self.get_context_text(ctx)
+            text = self.get_context_text(ctx).upper()
             # Extended pattern matching for SQL constructs
             patterns = COMPARISON_OPERATORS + ["LIKE", "IN", "BETWEEN", "ISNULL", "ISNOTNULL"]
             return any(op in text for op in patterns)
@@ -327,12 +327,14 @@ def _extract_field_name(self, ctx: Any) -> str:
         """Extract field name from comparison expression"""
         try:
             text = self.get_context_text(ctx)
+            text_upper = text.upper()
 
             # Handle SQL constructs with keywords
             sql_keywords = ["IN(", "LIKE", "BETWEEN", "ISNULL", "ISNOTNULL"]
             for keyword in sql_keywords:
-                if keyword in text:
-                    candidate = text.split(keyword, 1)[0].strip()
+                if keyword in text_upper:
+                    idx = text_upper.index(keyword)
+                    candidate = text[:idx].strip()
                     return self.normalize_field_path(candidate)
 
             # Try operator-based splitting
@@ -359,6 +361,7 @@ def _extract_operator(self, ctx: Any) -> str:
         """Extract comparison operator"""
         try:
             text = self.get_context_text(ctx)
+            text_upper = text.upper()
 
             # Check SQL constructs first (order matters for ISNOTNULL vs ISNULL)
             sql_constructs = {
@@ -370,7 +373,7 @@ def _extract_operator(self, ctx: Any) -> str:
             }
 
             for construct, operator in sql_constructs.items():
-                if construct in text:
+                if construct in text_upper:
                     return operator
 
             # Look for comparison operators
@@ -394,15 +397,16 @@ def _extract_value(self, ctx: Any) -> Any:
         """Extract value from comparison expression"""
         try:
             text = self.get_context_text(ctx)
+            text_upper = text.upper()
 
             # Handle SQL constructs with specific parsing needs
-            if "IN(" in text:
+            if "IN(" in text_upper:
                 return self._extract_in_values(text)
-            elif "LIKE" in text:
+            elif "LIKE" in text_upper:
                 return self._extract_like_pattern(text)
-            elif "BETWEEN" in text:
+            elif "BETWEEN" in text_upper:
                 return self._extract_between_range(text)
-            elif "ISNULL" in text or "ISNOTNULL" in text:
+            elif "ISNULL" in text_upper or "ISNOTNULL" in text_upper:
                 return None
 
             # Standard operator-based extraction
@@ -526,16 +530,24 @@ def _extract_in_values(self, text: str) -> List[Any]:
 
     def _extract_like_pattern(self, text: str) -> str:
         """Extract pattern from LIKE clause"""
-        parts = text.split("LIKE", 1)
-        return parts[1].strip().strip("'\"") if len(parts) == 2 else ""
+        idx = text.upper().find("LIKE")
+        if idx == -1:
+            return ""
+        return text[idx + 4 :].strip().strip("'\"")
 
     def _extract_between_range(self, text: str) -> Optional[Tuple[Any, Any]]:
         """Extract range values from BETWEEN clause"""
-        parts = text.split("BETWEEN", 1)
-        if len(parts) == 2 and "AND" in parts[1]:
-            range_values = parts[1].split("AND", 1)
-            if len(range_values) == 2:
-                return (self._parse_value(range_values[0].strip()), self._parse_value(range_values[1].strip()))
+        text_upper = text.upper()
+        between_idx = text_upper.find("BETWEEN")
+        if between_idx == -1:
+            return None
+        after = text[between_idx + 7 :]
+        after_upper = after.upper()
+        and_idx = after_upper.find("AND")
+        if and_idx != -1:
+            low = after[:and_idx].strip()
+            high = after[and_idx + 3 :].strip()
+            return (self._parse_value(low), self._parse_value(high))
         return None
 
 

tests/test_sql_parser_comprehensive.py

@@ -215,3 +215,103 @@ def test_6_conditions_with_brackets(self):
         for key in ["active", "deleted", "age", "name"]:
             assert key in flat, f"Missing expected key '{key}' in filter: {f}"
         assert "$or" in flat
+
+
+class TestCaseInsensitiveOperators:
+    """Test that SQL operators in WHERE clauses work regardless of case."""
+
+    # --- LIKE case variants ---
+
+    def test_like_lowercase(self):
+        sql = "SELECT * FROM col WHERE name like '%john%'"
+        plan = SQLParser(sql).get_execution_plan()
+        f = plan.filter_stage
+        assert "name" in f
+        assert "$regex" in f["name"]
+
+    def test_like_mixed_case(self):
+        sql = "SELECT * FROM col WHERE name Like '%john%'"
+        plan = SQLParser(sql).get_execution_plan()
+        f = plan.filter_stage
+        assert "name" in f
+        assert "$regex" in f["name"]
+
+    # --- IN case variants ---
+
+    def test_in_lowercase(self):
+        sql = "SELECT * FROM col WHERE status in ('a','b','c')"
+        plan = SQLParser(sql).get_execution_plan()
+        f = plan.filter_stage
+        assert "status" in f
+        assert "$in" in f["status"]
+
+    def test_in_mixed_case(self):
+        sql = "SELECT * FROM col WHERE status In ('a','b','c')"
+        plan = SQLParser(sql).get_execution_plan()
+        f = plan.filter_stage
+        assert "status" in f
+        assert "$in" in f["status"]
+
+    # --- BETWEEN case variants ---
+
+    def test_between_lowercase(self):
+        sql = "SELECT * FROM col WHERE age between 10 and 50"
+        plan = SQLParser(sql).get_execution_plan()
+        f = plan.filter_stage
+        assert "$and" in f
+        assert any("age" in cond and "$gte" in cond.get("age", {}) for cond in f["$and"])
+        assert any("age" in cond and "$lte" in cond.get("age", {}) for cond in f["$and"])
+
+    def test_between_mixed_case(self):
+        sql = "SELECT * FROM col WHERE age Between 10 And 50"
+        plan = SQLParser(sql).get_execution_plan()
+        f = plan.filter_stage
+        assert "$and" in f
+        assert any("age" in cond and "$gte" in cond.get("age", {}) for cond in f["$and"])
+        assert any("age" in cond and "$lte" in cond.get("age", {}) for cond in f["$and"])
+
+    # --- IS NULL / IS NOT NULL case variants ---
+
+    def test_is_null_lowercase(self):
+        sql = "SELECT * FROM col WHERE name is null"
+        plan = SQLParser(sql).get_execution_plan()
+        f = plan.filter_stage
+        assert "name" in f
+        assert f["name"] == {"$eq": None}
+
+    def test_is_not_null_lowercase(self):
+        sql = "SELECT * FROM col WHERE name is not null"
+        plan = SQLParser(sql).get_execution_plan()
+        f = plan.filter_stage
+        assert "name" in f
+        assert f["name"] == {"$ne": None}
+
+    # --- AND / OR case variants ---
+
+    def test_and_lowercase(self):
+        sql = "SELECT * FROM col WHERE age=30 and name='John'"
+        plan = SQLParser(sql).get_execution_plan()
+        assert plan.filter_stage == {"$and": [{"age": 30}, {"name": "John"}]}
+
+    def test_or_lowercase(self):
+        sql = "SELECT * FROM col WHERE age=30 or name='John'"
+        plan = SQLParser(sql).get_execution_plan()
+        assert plan.filter_stage == {"$or": [{"age": 30}, {"name": "John"}]}
+
+    # --- Mixed case operators in compound expressions ---
+
+    def test_like_and_bool_lowercase_operators(self):
+        sql = "SELECT * FROM col WHERE name like '%john%' and active=true"
+        plan = SQLParser(sql).get_execution_plan()
+        f = plan.filter_stage
+        assert "$and" in f
+        assert {"active": True} in f["$and"]
+        assert any("name" in cond and "$regex" in cond.get("name", {}) for cond in f["$and"])
+
+    def test_in_and_comparison_lowercase(self):
+        sql = "SELECT * FROM col WHERE status in ('a','b') and age>25"
+        plan = SQLParser(sql).get_execution_plan()
+        f = plan.filter_stage
+        assert "$and" in f
+        assert any("status" in cond and "$in" in cond.get("status", {}) for cond in f["$and"])
+        assert any("age" in cond and "$gt" in cond.get("age", {}) for cond in f["$and"])