准备可扩展类型系统工作，更合理的JOIN查询优化算法，并行查询

chusql-core/engine/chusql-core-engine.cabal

@@ -9,13 +9,18 @@ build-type:     Simple
 
 library
     hs-source-dirs:   src
-    exposed-modules:  ChuSQL.Core.Engine.Algebra.Eval
+    exposed-modules:  ChuSQL.Core.Engine.Algebra.Cost
+                      ChuSQL.Core.Engine.Algebra.Eval
                       ChuSQL.Core.Engine.Algebra.Expr
+                      ChuSQL.Core.Engine.Algebra.JoinOrder
                       ChuSQL.Core.Engine.Algebra.Op
                       ChuSQL.Core.Engine.Algebra.Optimize
                       ChuSQL.Core.Engine.Algebra.Planner
                       ChuSQL.Core.Engine.Algebra.Sort
+                      ChuSQL.Core.Engine.Builtin
+                      ChuSQL.Core.Engine.Error
                       ChuSQL.Core.Engine
+                      ChuSQL.Core.Engine.Parallel
                       ChuSQL.Core.Engine.Semantic
                       ChuSQL.Core.Engine.Storage
                       ChuSQL.Core.Engine.Storage.FFI
@@ -42,20 +47,6 @@ library
     default-language: Haskell2010
     ghc-options:      -Wall
 
-executable chusql-core-engine
-    main-is:          Main.hs
-    hs-source-dirs:   app
-    build-depends:    base
-                    , chusql-core-engine
-                    , chusql-core-model
-    default-language: Haskell2010
-    ghc-options:      -Wall
-    -- 运行期找 libchusql_core_storage.so：$ORIGIN 让二进制与动态库同目录即可
-    if os(linux)
-        ld-options: -Wl,-rpath,$ORIGIN
-    if os(osx)
-        ld-options: -Wl,-rpath,@loader_path
-
 test-suite chusql-core-engine-test
     type:             exitcode-stdio-1.0
     main-is:          Spec.hs
@@ -65,6 +56,7 @@ test-suite chusql-core-engine-test
                     , chusql-core-model
                     , directory
                     , filepath
+                    , hashable
                     , hspec
     default-language: Haskell2010
-    ghc-options:      -Wall
+    ghc-options:      -Wall -threaded