diff --git a/lib/active_record/connection_adapters/pinot_adapter.rb b/lib/active_record/connection_adapters/pinot_adapter.rb
index 9762bdf..a975e98 100644
--- a/lib/active_record/connection_adapters/pinot_adapter.rb
+++ b/lib/active_record/connection_adapters/pinot_adapter.rb
@@ -13,6 +13,20 @@ def pinot_connection(config)
 
   module ConnectionAdapters
     class PinotAdapter < AbstractAdapter
+      NULL_REGEX = /^null$/i
+      SINGLE_QUOTED_STRING_REGEX = /^'([^|]*)'$/m
+      DOUBLE_QUOTED_STRING_REGEX = /^"([^|]*)"$/m
+      NUMERIC_REGEX = /\A-?\d+(\.\d*)?\z/
+      BINARY_HEX_REGEX = /x'(.*)'/
+      # Matches SQL functions or expressions (e.g., NOW(), CURRENT_DATE, or string concatenation)
+      SQL_FUNCTION_OR_EXPRESSION_REGEX = %r{
+        \w+\(.*\)            | # SQL functions like NOW(), uuid_generate_v4(), etc.
+        CURRENT_TIME         | # special SQL keyword
+        CURRENT_DATE         | # special SQL keyword
+        CURRENT_TIMESTAMP    | # special SQL keyword
+        \|\|                  # SQL string concatenation operator
+      }x
+  
       TYPES = {
         "INT" => Type::Integer.new,
         "TIMESTAMP" => Type::DateTime.new,
@@ -21,6 +35,7 @@ class PinotAdapter < AbstractAdapter
         "STRING" => Type::String.new,
         "JSON" => ActiveRecord::Type::Json.new
       }
+      
       def initialize(config = {})
         @pinot_host = config.fetch(:host)
         @pinot_port = config.fetch(:port)
@@ -84,24 +99,16 @@ def new_column_from_field(table_name, field, definitions = nil)
 
       def extract_value_from_default(default)
         case default
-        when /^null$/i
-          nil
-        # Quoted types
-        when /^'([^|]*)'$/m
-          $1.gsub("''", "'")
-        # Quoted types
-        when /^"([^|]*)"$/m
-          $1.gsub('""', '"')
-        # Numeric types
-        when /\A-?\d+(\.\d*)?\z/
-          $&
-        # Binary columns
-        when /x'(.*)'/
-          [$1].pack("H*")
-        else
-          # Anything else is blank or some function
-          # and we can't know the value of that, so return nil.
+        when NULL_REGEX
           nil
+        when SINGLE_QUOTED_STRING_REGEX
+          ::Regexp.last_match(1).gsub("''", "'")
+        when DOUBLE_QUOTED_STRING_REGEX
+          ::Regexp.last_match(1).gsub('""', '"')
+        when NUMERIC_REGEX
+          ::Regexp.last_match(0)
+        when BINARY_HEX_REGEX
+          [::Regexp.last_match(1)].pack('H*')
         end
       end
 
@@ -110,7 +117,7 @@ def extract_default_function(default_value, default)
       end
 
       def has_default_function?(default_value, default)
-        !default_value && %r{\w+\(.*\)|CURRENT_TIME|CURRENT_DATE|CURRENT_TIMESTAMP|\|\|}.match?(default)
+        !default_value && SQL_FUNCTION_OR_EXPRESSION_REGEX.match?(default)
       end
 
       INTEGER_REGEX = /integer/i