ExecutableUserDefinedFunction prevent function execution during query analysis

src/Common/ProfileEvents.cpp

@@ -112,6 +112,8 @@
     M(CompileExpressionsMicroseconds, "Total time spent for compilation of expressions to LLVM code.") \
     M(CompileExpressionsBytes, "Number of bytes used for expressions compilation.") \
     \
+    M(ExecuteShellCommand, "Number of shell command executions.") \
+    \
     M(ExternalSortWritePart, "") \
     M(ExternalSortMerge, "") \
     M(ExternalAggregationWritePart, "") \

src/Common/ShellCommand.cpp

@@ -29,6 +29,11 @@ namespace
     };
 }
 
+namespace ProfileEvents
+{
+    extern const int ExecuteShellCommand;
+}
+
 namespace DB
 {
 
@@ -158,6 +163,7 @@ std::unique_ptr<ShellCommand> ShellCommand::executeImpl(
     const Config & config)
 {
     logCommand(filename, argv);
+    ProfileEvents::increment(ProfileEvents::ExecuteShellCommand);
 
 #if !defined(USE_MUSL)
     /** Here it is written that with a normal call `vfork`, there is a chance of deadlock in multithreaded programs,

src/Interpreters/UserDefinedExecutableFunctionFactory.cpp

@@ -57,6 +57,10 @@ public:
 
     ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const override
     {
+        /// Do not start user defined script during query analysis. Because user script startup could be heavy.
+        if (input_rows_count == 0)
+            return result_type->createColumn();
+
         auto coordinator = executable_function->getCoordinator();
         const auto & coordinator_configuration = coordinator->getConfiguration();
         const auto & configuration = executable_function->getConfiguration();