feat(sql-udf): add semantic check when creating sql udf (risingwavela…

…bs#14549)

e2e_test/udf/sql_udf.slt

@@ -28,12 +28,12 @@ create function add_return(INT, INT) returns int language sql return $1 + $2;
 statement ok
 create function add_return_binding() returns int language sql return add_return(1, 1) + add_return(1, 1);
 
-# Recursive definition can be accepted, but will be eventually rejected during runtime
-statement ok
+# Recursive definition can NOT be accepted at present due to semantic check
+statement error failed to conduct semantic check, please see if you are calling non-existence functions
 create function recursive(INT, INT) returns int language sql as 'select recursive($1, $2) + recursive($1, $2)';
 
 # Complex but error-prone definition, recursive & normal sql udfs interleaving
-statement ok
+statement error failed to conduct semantic check, please see if you are calling non-existence functions
 create function recursive_non_recursive(INT, INT) returns int language sql as 'select recursive($1, $2) + sub($1, $2)';
 
 # Recursive corner case
@@ -46,7 +46,7 @@ create function add_sub_wrapper(INT, INT) returns int language sql as 'select ad
 
 # Create a valid recursive function
 # Please note we do NOT support actual running the recursive sql udf at present
-statement ok
+statement error failed to conduct semantic check, please see if you are calling non-existence functions
 create function fib(INT) returns int
  language sql as 'select case
         when $1 = 0 then 0
@@ -57,12 +57,12 @@ create function fib(INT) returns int
       end;';
 
 # The execution will eventually exceed the pre-defined max stack depth
-statement error function fib calling stack depth limit exceeded
-select fib(100);
+# statement error function fib calling stack depth limit exceeded
+# select fib(100);
 
 # Currently create a materialized view with a recursive sql udf will be rejected
-statement error function fib calling stack depth limit exceeded
-create materialized view foo_mv as select fib(100);
+# statement error function fib calling stack depth limit exceeded
+# create materialized view foo_mv as select fib(100);
 
 statement ok
 create function regexp_replace_wrapper(varchar) returns varchar language sql as $$select regexp_replace($1, 'baz(...)', '这是🥵', 'ic')$$;
@@ -77,6 +77,10 @@ create function print_add_one(INT) returns int language sql as 'select print($1
 statement ok
 create function print_add_two(INT) returns int language sql as 'select print($1 + $1)';
 
+# Calling a non-existence function
+statement error failed to conduct semantic check, please see if you are calling non-existence functions
+create function non_exist(INT) returns int language sql as 'select yo(114514)';
+
 # Call the defined sql udf
 query I
 select add(1, -1);
@@ -124,12 +128,12 @@ select foo(114514);
 foo(INT)
 
 # Rejected deep calling stack
-statement error function recursive calling stack depth limit exceeded
-select recursive(1, 1);
+# statement error function recursive calling stack depth limit exceeded
+# select recursive(1, 1);
 
 # Same as above
-statement error function recursive calling stack depth limit exceeded
-select recursive_non_recursive(1, 1);
+# statement error function recursive calling stack depth limit exceeded
+# select recursive_non_recursive(1, 1);
 
 query I
 select add_sub_wrapper(1, 1);
@@ -168,12 +172,12 @@ select c1, c2, add_return(c1, c2) from t1 order by c1 asc;
 5 5 10
 
 # Recursive sql udf with normal table
-statement error function fib calling stack depth limit exceeded
-select fib(c1) from t1;
+# statement error function fib calling stack depth limit exceeded
+# select fib(c1) from t1;
 
 # Recursive sql udf with materialized view
-statement error function fib calling stack depth limit exceeded
-create materialized view bar_mv as select fib(c1) from t1;
+# statement error function fib calling stack depth limit exceeded
+# create materialized view bar_mv as select fib(c1) from t1;
 
 # Invalid function body syntax
 statement error Expected an expression:, found: EOF at the end
@@ -259,20 +263,20 @@ drop function call_regexp_replace;
 statement ok
 drop function add_sub_wrapper;
 
-statement ok
-drop function recursive;
+# statement ok
+# drop function recursive;
 
 statement ok
 drop function foo;
 
-statement ok
-drop function recursive_non_recursive;
+# statement ok
+# drop function recursive_non_recursive;
 
 statement ok
 drop function add_sub_types;
 
-statement ok
-drop function fib;
+# statement ok
+# drop function fib;
 
 statement ok
 drop function print;

src/frontend/src/binder/mod.rs

@@ -415,6 +415,10 @@ impl Binder {
     pub fn set_clause(&mut self, clause: Option<Clause>) {
         self.context.clause = clause;
     }
+
+    pub fn udf_context_mut(&mut self) -> &mut UdfContext {
+        &mut self.udf_context
+    }
 }
 
 /// The column name stored in [`BindContext`] for a column without an alias.

src/frontend/src/handler/create_sql_function.rs

@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+use std::collections::HashMap;
+
 use itertools::Itertools;
 use pgwire::pg_response::StatementType;
 use risingwave_common::catalog::FunctionId;
@@ -25,8 +27,60 @@ use risingwave_sqlparser::parser::{Parser, ParserError};
 
 use super::*;
 use crate::catalog::CatalogError;
+use crate::expr::{ExprImpl, Literal};
 use crate::{bind_data_type, Binder};
 
+/// Create a mock `udf_context`, which is used for semantic check
+fn create_mock_udf_context(arg_types: Vec<DataType>) -> HashMap<String, ExprImpl> {
+    (1..=arg_types.len())
+        .map(|i| {
+            let mock_expr =
+                ExprImpl::Literal(Box::new(Literal::new(None, arg_types[i - 1].clone())));
+            (format!("${i}"), mock_expr.clone())
+        })
+        .collect()
+}
+
+fn extract_udf_expression(ast: Vec<Statement>) -> Result<Expr> {
+    if ast.len() != 1 {
+        return Err(ErrorCode::InvalidInputSyntax(
+            "the query for sql udf should contain only one statement".to_string(),
+        )
+        .into());
+    }
+
+    // Extract the expression out
+    let Statement::Query(query) = ast[0].clone() else {
+        return Err(ErrorCode::InvalidInputSyntax(
+            "invalid function definition, please recheck the syntax".to_string(),
+        )
+        .into());
+    };
+
+    let SetExpr::Select(select) = query.body else {
+        return Err(ErrorCode::InvalidInputSyntax(
+            "missing `select` body for sql udf expression, please recheck the syntax".to_string(),
+        )
+        .into());
+    };
+
+    if select.projection.len() != 1 {
+        return Err(ErrorCode::InvalidInputSyntax(
+            "`projection` should contain only one `SelectItem`".to_string(),
+        )
+        .into());
+    }
+
+    let SelectItem::UnnamedExpr(expr) = select.projection[0].clone() else {
+        return Err(ErrorCode::InvalidInputSyntax(
+            "expect `UnnamedExpr` for `projection`".to_string(),
+        )
+        .into());
+    };
+
+    Ok(expr)
+}
+
 pub async fn handle_create_sql_function(
     handler_args: HandlerArgs,
     or_replace: bool,
@@ -45,7 +99,8 @@ pub async fn handle_create_sql_function(
     }
 
     let language = "sql".to_string();
-    // Just a basic sanity check for language
+
+    // Just a basic sanity check for `language`
     if !matches!(params.language, Some(lang) if lang.real_value().to_lowercase() == "sql") {
         return Err(ErrorCode::InvalidParameterValue(
             "`language` for sql udf must be `sql`".to_string(),
@@ -149,6 +204,30 @@ pub async fn handle_create_sql_function(
         return Err(ErrorCode::InvalidInputSyntax(err).into());
     } else {
         debug_assert!(parse_result.is_ok());
+
+        // Conduct semantic check (e.g., see if the inner calling functions exist, etc.)
+        let ast = parse_result.unwrap();
+        let mut binder = Binder::new_for_system(session);
+
+        binder
+            .udf_context_mut()
+            .update_context(create_mock_udf_context(arg_types.clone()));
+
+        if let Ok(expr) = extract_udf_expression(ast) {
+            if let Err(e) = binder.bind_expr(expr) {
+                return Err(ErrorCode::InvalidInputSyntax(
+                    format!("failed to conduct semantic check, please see if you are calling non-existence functions.\nDetailed error: {e}")
+                )
+                .into());
+            }
+        } else {
+            return Err(ErrorCode::InvalidInputSyntax(
+                "failed to parse the input query and extract the udf expression,
+                please recheck the syntax"
+                    .to_string(),
+            )
+            .into());
+        }
     }
 
     // Create the actual function, will be stored in function catalog