From e4acb3d81586581c30cb1852abb436e0622d5150 Mon Sep 17 00:00:00 2001
From: George Sittas <giwrgos.sittas@gmail.com>
Date: Mon, 28 Jul 2025 14:33:12 +0300
Subject: [PATCH] Chore: log rendered jinja right before parsing it to improve
 debugging

---
 sqlmesh/core/renderer.py |  3 +++
 tests/core/test_model.py | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/sqlmesh/core/renderer.py b/sqlmesh/core/renderer.py
index f2e9e24056..dc89e15af6 100644
--- a/sqlmesh/core/renderer.py
+++ b/sqlmesh/core/renderer.py
@@ -215,6 +215,9 @@ def _resolve_table(table: str | exp.Table) -> str:
             try:
                 expressions = []
                 rendered_expression = jinja_env.from_string(self._expression.name).render()
+                logger.debug(
+                    f"Rendered Jinja expression for model '{self._model_fqn}' at '{self._path}': '{rendered_expression}'"
+                )
                 if rendered_expression.strip():
                     expressions = [e for e in parse(rendered_expression, read=self._dialect) if e]
 
diff --git a/tests/core/test_model.py b/tests/core/test_model.py
index a99920b420..b7c74f90a2 100644
--- a/tests/core/test_model.py
+++ b/tests/core/test_model.py
@@ -8534,6 +8534,38 @@ def test_comments_in_jinja_query():
         model.render_query()
 
 
+def test_jinja_render_debug_logging(caplog):
+    """Test that rendered Jinja expressions are logged for debugging."""
+    import logging
+
+    # Set log level to DEBUG to capture debug logs
+    caplog.set_level(logging.DEBUG, logger="sqlmesh.core.renderer")
+
+    # Create a model with unparseable Jinja that will be rendered
+    expressions = d.parse(
+        """
+        MODEL (name db.test_model);
+
+        JINJA_QUERY_BEGIN;
+        {{ 'SELECT invalid syntax here!' }}
+        JINJA_END;
+        """
+    )
+
+    model = load_sql_based_model(expressions)
+
+    # Attempt to render - this should fail due to invalid SQL syntax
+    with pytest.raises(ConfigError, match=r"Could not render or parse jinja"):
+        model.render_query()
+
+    # Check that the rendered Jinja was logged
+    assert any(
+        'Rendered Jinja expression for model \'"db"."test_model"\'' in record.message
+        and "SELECT invalid syntax here!" in record.message
+        for record in caplog.records
+    )
+
+
 def test_staged_file_path():
     expressions = d.parse(
         """