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Author: google-labs-jules[bot]

src/functions/extract_domain.cpp

@@ -32,7 +32,8 @@ namespace duckdb
             }
             catch (const std::exception &e)
             {
-                result_data[i] = "Error extracting domain: " + std::string (e.what ());
+                // Set NULL on error
+                FlatVector::SetNull (result, i, true);
             }
         }
     }
@@ -45,18 +46,26 @@ namespace duckdb
             Connection con (db);
 
             // Extract the host from the URL
-            std::regex host_regex (R"(^(?:(?:https?|ftp|rsync):\/\/|mailto:)?((?:[^\/\?:#@]+@)?([^\/\?:#]+)))");
+            // This regex captures the host, excluding protocol, path, query, fragment, and port.
+            // It explicitly excludes '/', '\s', '#', '?', ':' from the host.
+            std::regex host_regex (R"(^(?:(?:https?|ftp|rsync):\/\/)?([^\/\s#?:]+))");
             std::smatch host_match;
-            if (!std::regex_search (input, host_match, host_regex))
+            std::string host_str; // Use a separate string for the matched host
+
+            // Search for the host in the input string
+            // No need for searchable_input, regex_search can take input directly
+            if (std::regex_search (input, host_match, host_regex) && host_match.size () > 1)
             {
-                return "";
+                host_str = host_match[1].str ();
+            }
+            else
+            {
+                return ""; // No host found
             }
-
-            auto host = host_match[host_match.size () - 1].str ();
 
             // Split the host into parts
             std::vector<std::string> parts;
-            std::istringstream stream (host);
+            std::istringstream stream (host_str);
             std::string part;
             while (std::getline (stream, part, '.'))
             {
@@ -65,8 +74,29 @@ namespace duckdb
 
             // Find the longest matching public suffix
             std::string public_suffix;
-            int public_suffix_index = -1;
-
+            int public_suffix_index = -1; // Using -1 to indicate no valid public suffix part found yet
+
+            // Iterate through all possible suffix combinations, from shortest to longest.
+            // The goal is to find the longest known public suffix.
+            // For example, for 'a.b.c.co.uk', it will test:
+            // uk, co.uk, c.co.uk, b.c.co.uk, a.b.c.co.uk
+            // If 'co.uk' is a public suffix, it will be matched.
+            // If 'c.co.uk' is also a public suffix (e.g. *.sch.uk), that would be matched.
+            // The last and longest match is chosen by breaking after the first DB match,
+            // assuming suffixes are ordered or queried appropriately by the PSL logic.
+            // However, the original loop structure implies checking all parts and
+            // the longest one that is a PSL entry should be chosen.
+            // The current logic takes the *first* match from the right that is a PSL entry.
+            // Let's refine the comment to reflect the actual loop behavior.
+
+            // Iterate through parts of the hostname from right to left to find the longest public suffix.
+            // For 'a.b.c.co.uk', it will form candidates:
+            // 1. uk
+            // 2. co.uk
+            // 3. c.co.uk
+            // 4. b.c.co.uk
+            // 5. a.b.c.co.uk
+            // It stops at the first and longest valid suffix found in the public_suffix_list.
             for (size_t j = 0; j < parts.size (); j++)
             {
                 // Build the candidate suffix

src/functions/extract_extension.cpp

@@ -26,7 +26,8 @@ namespace duckdb
             }
             catch (const std::exception &e)
             {
-                result_data[i] = "Error extracting extension: " + std::string (e.what ());
+                // Set NULL on error
+                FlatVector::SetNull (result, i, true);
             }
         };
     }

src/functions/extract_host.cpp

@@ -26,7 +26,8 @@ namespace duckdb
             }
             catch (const std::exception &e)
             {
-                result_data[i] = "Error extracting host: " + std::string (e.what ());
+                // Set NULL on error
+                FlatVector::SetNull (result, i, true);
             }
         }
     }

src/functions/extract_path.cpp

@@ -15,8 +15,8 @@ namespace duckdb
 
         for (idx_t i = 0; i < args.size (); i++)
         {
+            // Paths are often case-sensitive, so we don't convert to lowercase.
             auto input = input_vector.GetValue (i).ToString ();
-            std::transform (input.begin (), input.end (), input.begin (), ::tolower);
 
             try
             {
@@ -26,7 +26,8 @@ namespace duckdb
             }
             catch (const std::exception &e)
             {
-                result_data[i] = "Error extracting path: " + std::string (e.what ());
+                // Set NULL on error
+                FlatVector::SetNull (result, i, true);
             }
         };
     }

src/functions/extract_port.cpp

@@ -26,7 +26,8 @@ namespace duckdb
             }
             catch (const std::exception &e)
             {
-                result_data[i] = "Error extracting port: " + std::string (e.what ());
+                // Set NULL on error
+                FlatVector::SetNull (result, i, true);
             }
         };
     }

src/functions/extract_query.cpp

@@ -25,7 +25,8 @@ namespace duckdb
             }
             catch (const std::exception &e)
             {
-                result_data[i] = "Error extracting query string: " + std::string (e.what ());
+                // Set NULL on error
+                FlatVector::SetNull (result, i, true);
             }
         };
     }
@@ -36,9 +37,13 @@ namespace duckdb
         {
             // Regex to match the query string component of a URL
             // Explanation:
-            // (?:\?|&)  - Non-capturing group to match either "?" (start of query) or "&" (query parameter separator)
-            // ([^#]+)   - Capturing group to match the query string (any characters except "#")
-            std::regex query_regex (R"((?:\?|&)([^#]+))");
+            // \?        - Matches the literal '?' character.
+            // ([^#]*)   - Capturing group:
+            //   [^#]    - Matches any character that is NOT a '#'.
+            //   *       - Matches the previous character zero or more times.
+            // This regex captures content after the first '?' up to a '#' or end of string.
+            // Does not handle query parameters in fragments.
+            std::regex query_regex (R"(\?([^#]*))");
             std::smatch query_match;
 
             // Use regex_search to find the query string in the input

src/functions/extract_schema.cpp

@@ -26,7 +26,8 @@ namespace duckdb
             }
             catch (const std::exception &e)
             {
-                result_data[i] = "Error extracting schema: " + std::string (e.what ());
+                // Set NULL on error
+                FlatVector::SetNull (result, i, true);
             }
         };
     }

src/functions/extract_subdomain.cpp

@@ -28,7 +28,8 @@ namespace duckdb
             }
             catch (const std::exception &e)
             {
-                result_data[i] = "Error extracting subdomain: " + std::string (e.what ());
+                // Set NULL on error
+                FlatVector::SetNull (result, i, true);
             }
         }
     }
@@ -43,18 +44,25 @@ namespace duckdb
             Connection con (db);
 
             // Extract the host from the URL
-            std::regex host_regex (R"(^(?:(?:https?|ftp|rsync):\/\/)?([^\/\?:]+))");
+            // This regex captures the host, excluding protocol, path, query, fragment, and port.
+            // It explicitly excludes '/', '\s', '#', '?', ':' from the host.
+            std::regex host_regex (R"(^(?:(?:https?|ftp|rsync):\/\/)?([^\/\s#?:]+))");
             std::smatch host_match;
-            if (!std::regex_search (input, host_match, host_regex))
+            std::string host_str;
+
+            // No need for searchable_input, regex_search can take input directly
+            if (std::regex_search (input, host_match, host_regex) && host_match.size () > 1)
             {
-                return "";
+                host_str = host_match[1].str ();
+            }
+            else
+            {
+                return ""; // No host found
             }
-
-            auto host = host_match[1].str ();
 
             // Split the host into parts
             std::vector<std::string> parts;
-            std::istringstream stream (host);
+            std::istringstream stream (host_str);
             std::string part;
             while (std::getline (stream, part, '.'))
             {
@@ -65,6 +73,14 @@ namespace duckdb
             std::string public_suffix;
             int public_suffix_index = -1;
 
+            // Iterate through all possible suffix combinations, from shortest to longest.
+            // The goal is to find the longest known public suffix.
+            // For example, for 'a.b.c.co.uk', it will test:
+            // uk, co.uk, c.co.uk, b.c.co.uk, a.b.c.co.uk
+            // If 'co.uk' is a public suffix, it will be matched.
+            // If 'c.co.uk' is also a public suffix (e.g. *.sch.uk), that would be matched.
+            // The last and longest match is chosen.
+            // The current logic takes the *first* match from the right that is a PSL entry.
             for (size_t j = 0; j < parts.size (); j++)
             {
                 // Build the candidate suffix

src/functions/extract_tld.cpp

@@ -28,7 +28,8 @@ namespace duckdb
             }
             catch (const std::exception &e)
             {
-                result_data[i] = "Error extracting tld: " + std::string (e.what ());
+                // Set NULL on error
+                FlatVector::SetNull (result, i, true);
             }
         }
     }
@@ -43,18 +44,25 @@ namespace duckdb
             Connection con (db);
 
             // Extract the host from the URL
-            std::regex host_regex (R"(^(?:(?:https?|ftp|rsync):\/\/)?([^\/\?:]+))");
+            // This regex captures the host, excluding protocol, path, query, fragment, and port.
+            // It explicitly excludes '/', '\s', '#', '?', ':' from the host.
+            std::regex host_regex (R"(^(?:(?:https?|ftp|rsync):\/\/)?([^\/\s#?:]+))");
             std::smatch host_match;
-            if (!std::regex_search (input, host_match, host_regex))
+            std::string host_str;
+
+            // No need for searchable_input, regex_search can take input directly
+            if (std::regex_search (input, host_match, host_regex) && host_match.size () > 1)
             {
-                return "";
+                host_str = host_match[1].str ();
+            }
+            else
+            {
+                return ""; // No host found
             }
-
-            auto host = host_match[1].str ();
 
             // Split the host into parts
             std::vector<std::string> parts;
-            std::istringstream stream (host);
+            std::istringstream stream (host_str);
             std::string part;
             while (std::getline (stream, part, '.'))
             {
@@ -64,6 +72,14 @@ namespace duckdb
             // Find the longest matching public suffix
             std::string public_suffix;
 
+            // Iterate through all possible suffix combinations, from shortest to longest.
+            // The goal is to find the longest known public suffix.
+            // For example, for 'a.b.c.co.uk', it will test:
+            // uk, co.uk, c.co.uk, b.c.co.uk, a.b.c.co.uk
+            // If 'co.uk' is a public suffix, it will be matched.
+            // If 'c.co.uk' is also a public suffix (e.g. *.sch.uk), that would be matched.
+            // The last and longest match is chosen.
+            // The current logic takes the *first* match from the right that is a PSL entry.
             for (size_t j = 0; j < parts.size (); j++)
             {
                 // Build the candidate suffix