Fix equality operator in the generated SQL

Author: solnic

lib/sql/composer/nodes/operations/eql.rb

@@ -21,7 +21,7 @@ def or(other)
           alias_method :OR, :or
 
           def to_s
-            "#{left.to_s} == #{right.to_s}"
+            "#{left.to_s} = #{right.to_s}"
           end
         end
       end

spec/integration/sql/compose_spec.rb

@@ -59,7 +59,7 @@ def compose(&block)
           <<~SQL.strip
             SELECT "users"."id", "users"."name"
             FROM "users"
-            WHERE "users"."name" == 'Jane'
+            WHERE "users"."name" = 'Jane'
           SQL
         )
       end
@@ -114,7 +114,7 @@ def compose(&block)
           <<~SQL.strip
             SELECT "users"."id", "users"."name"
             FROM "users"
-            WHERE "users"."name" == 'Jane'
+            WHERE "users"."name" = 'Jane'
           SQL
         )
       end
@@ -134,7 +134,7 @@ def compose(&block)
           <<~SQL.strip
             SELECT "users"."id", "users"."name"
             FROM "users"
-            WHERE ("users"."name" == 'Jane') OR ("users"."name" == 'Jade')
+            WHERE ("users"."name" = 'Jane') OR ("users"."name" = 'Jade')
           SQL
         )
       end
@@ -158,7 +158,7 @@ def compose(&block)
           <<~SQL.strip
             SELECT "users"."id", "users"."name"
             FROM "users"
-            WHERE "users"."name" == 'Jane'
+            WHERE "users"."name" = 'Jane'
           SQL
         )
       end
@@ -178,7 +178,7 @@ def compose(&block)
           <<~SQL.strip
             SELECT "users"."id", "users"."name"
             FROM "users"
-            WHERE "users"."name" == 'Jane'
+            WHERE "users"."name" = 'Jane'
           SQL
         )
       end
@@ -199,7 +199,7 @@ def compose(&block)
           <<~SQL.strip
             SELECT "users"."id", "users"."name"
             FROM "users"
-            WHERE "users"."name" == 'Jane'
+            WHERE "users"."name" = 'Jane'
             ORDER BY "users"."id" DESC
           SQL
         )