diff --git a/src/Interpreters/ExpressionJIT.cpp b/src/Interpreters/ExpressionJIT.cpp
index 9564437f72e..4169d95bfa4 100644
--- a/src/Interpreters/ExpressionJIT.cpp
+++ b/src/Interpreters/ExpressionJIT.cpp
@@ -45,8 +45,6 @@ static Poco::Logger * getLogger()
 
 class LLVMExecutableFunction : public IExecutableFunctionImpl
 {
-    std::string name;
-    JITCompiledFunction function = nullptr;
 public:
 
     explicit LLVMExecutableFunction(const std::string & name_, JITCompiledFunction function_)
@@ -73,13 +71,13 @@ public:
             result_column = result_column->cloneResized(input_rows_count);
 
             std::vector<ColumnData> columns(arguments.size() + 1);
+            std::vector<ColumnPtr> columns_backup;
+
             for (size_t i = 0; i < arguments.size(); ++i)
             {
-                const auto * column = arguments[i].column.get();
-                if (!column)
-                    throw Exception(ErrorCodes::LOGICAL_ERROR, "Column {} is missing", arguments[i].name);
-
-                columns[i] = getColumnData(column);
+                auto column = arguments[i].column->convertToFullColumnIfConst();
+                columns_backup.emplace_back(column);
+                columns[i] = getColumnData(column.get());
             }
 
             columns[arguments.size()] = getColumnData(result_column.get());
@@ -111,6 +109,9 @@ public:
         return result_column;
     }
 
+private:
+    std::string name;
+    JITCompiledFunction function = nullptr;
 };
 
 class LLVMFunction : public IFunctionBaseImpl
diff --git a/src/Interpreters/JIT/CompileDAG.h b/src/Interpreters/JIT/CompileDAG.h
index 2485e4e4303..3872a896e38 100644
--- a/src/Interpreters/JIT/CompileDAG.h
+++ b/src/Interpreters/JIT/CompileDAG.h
@@ -30,7 +30,7 @@ namespace DB
   * Node a, Constant 1, Function add(a + 1), Input b, Constant 1, Function add(b, 1), Function add(add(a + 1), add(a + 1)).
   *
   * Compile function must be called with input_nodes_values equal to input nodes count.
-  * During compile funciton call CompileDAG is compiled in order of added nodes.
+  * When compile method is called added nodes are compiled in order.
   */
 class CompileDAG
 {
diff --git a/src/Interpreters/JIT/compileFunction.cpp b/src/Interpreters/JIT/compileFunction.cpp
index 92a7b189645..a17591bc96f 100644
--- a/src/Interpreters/JIT/compileFunction.cpp
+++ b/src/Interpreters/JIT/compileFunction.cpp
@@ -15,10 +15,10 @@ namespace
 {
     struct ColumnDataPlaceholder
     {
-        llvm::Value * data_init; /// first row
-        llvm::Value * null_init;
-        llvm::PHINode * data; /// current row
-        llvm::PHINode * null;
+        llvm::Value * data_init = nullptr; /// first row
+        llvm::Value * null_init = nullptr;
+        llvm::PHINode * data = nullptr; /// current row
+        llvm::PHINode * null = nullptr;
     };
 }
 
@@ -78,11 +78,11 @@ static void compileFunction(llvm::Module & module, const IFunctionBaseImpl & fun
     llvm::Value * counter_arg = &*args++;
     llvm::Value * columns_arg = &*args++;
 
-    /// Initialize ColumnDataPlaceholder llvm represenation of ColumnData
-    /// Last columns ColumnDataPlaceholder is result column
+    /// Initialize ColumnDataPlaceholder llvm representation of ColumnData
 
     auto * entry = llvm::BasicBlock::Create(b.getContext(), "entry", func);
     b.SetInsertPoint(entry);
+
     std::vector<ColumnDataPlaceholder> columns(arg_types.size() + 1);
     for (size_t i = 0; i <= arg_types.size(); ++i)
     {
diff --git a/src/Interpreters/JIT/compileFunction.h b/src/Interpreters/JIT/compileFunction.h
index f571f18d6a4..ae8a5f0ad13 100644
--- a/src/Interpreters/JIT/compileFunction.h
+++ b/src/Interpreters/JIT/compileFunction.h
@@ -23,7 +23,7 @@ struct ColumnData
 };
 
 /** Returns ColumnData for column.
-  * If constant column is passed, LOGICAL_ERROR will be throwed.
+  * If constant column is passed, LOGICAL_ERROR will be thrown.
   */
 ColumnData getColumnData(const IColumn * column);