Persist SQL param indexes over SQL adapter

edb/pgsql/resolver/__init__.py

@@ -67,6 +67,7 @@ def resolve(
 
     _ = context.ResolverContext(initial=ctx)
 
+    command.init_external_params(query, ctx)
     top_level_ctes = command.compile_dml(query, ctx=ctx)
 
     resolved = dispatch.resolve(query, ctx=ctx)

edb/pgsql/resolver/command.py

@@ -727,7 +727,8 @@ def _uncompile_insert_pointer_stmt(
     sub_name = sub.get_shortname(ctx.schema)
 
     target_ql: qlast.Expr = qlast.Path(
-        steps=[value_ql, qlast.Ptr(name='__target__')])
+        steps=[value_ql, qlast.Ptr(name='__target__')]
+    )
 
     if isinstance(sub_target, s_objtypes.ObjectType):
         assert isinstance(target_ql, qlast.Path)
@@ -2093,3 +2094,20 @@ def __init__(self, mapping: Dict[int, int]) -> None:
 
     def visit_Param(self, p: pgast.Param) -> None:
         p.index = self.mapping[p.index]
+
+
+def init_external_params(query: pgast.Base, ctx: Context):
+    counter = ParamCounter()
+    counter.node_visit(query)
+    for _ in range(counter.param_count):
+        ctx.query_params.append(dbstate.SQLParamExternal())
+
+
+class ParamCounter(ast.NodeVisitor):
+    def __init__(self) -> None:
+        super().__init__()
+        self.param_count = 0
+
+    def visit_ParamRef(self, p: pgast.ParamRef) -> None:
+        if self.param_count < p.number:
+            self.param_count = p.number

edb/pgsql/resolver/expr.py

@@ -29,7 +29,6 @@
 from edb.pgsql import common
 from edb.pgsql import compiler as pgcompiler
 from edb.pgsql.compiler import enums as pgce
-from edb.server.compiler import dbstate
 
 from edb.schema import types as s_types
 
@@ -513,20 +512,8 @@ def resolve_ParamRef(
     *,
     ctx: Context,
 ) -> pgast.ParamRef:
-    internal_index: Optional[int] = None
-    param: Optional[dbstate.SQLParam] = None
-    for i, p in enumerate(ctx.query_params):
-        if isinstance(p, dbstate.SQLParamExternal) and p.index == expr.number:
-            param = p
-            internal_index = i + 1
-            break
-    if not param:
-        param = dbstate.SQLParamExternal(index=expr.number)
-        internal_index = len(ctx.query_params) + 1
-        ctx.query_params.append(param)
-    assert internal_index
-
-    return pgast.ParamRef(number=internal_index)
+    # external params map one-to-one to internal params
+    return expr
 
 
 @dispatch._resolve.register

edb/server/compiler/dbstate.py

@@ -600,8 +600,8 @@ class SQLParamExternal(SQLParam):
     # An internal query param whose value is provided by an external param.
     # So a user-visible param.
 
-    # External index
-    index: int
+    # External params share the index with internal params
+    pass
 
 
 @dataclasses.dataclass(kw_only=True, eq=False, slots=True, repr=False)

edb/server/pgcon/pgcon.pyx

@@ -1782,23 +1782,19 @@ cdef class PGConnection:
                     # include the internal params for globals.
                     # This chunk of code remaps the descriptions of internal
                     # params into external ones.
-                    count_internal = self.buffer.read_int16()
+                    self.buffer.read_int16()  # count_internal
                     data_internal = self.buffer.consume_message()
 
                     msg_buf = WriteBuffer.new_message(b't')
-                    external_params = []
+                    external_params: int64_t = 0
                     if action.query_unit.params:
-                        for i_int, param in enumerate(action.query_unit.params):
-                            if isinstance(param, dbstate.SQLParamExternal):
-                                i_ext = param.index - 1
-                                external_params.append((i_ext, i_int))
+                        for index, param in enumerate(action.query_unit.params):
+                            if not isinstance(param, dbstate.SQLParamExternal):
+                                break
+                            external_params = index + 1
 
-                    msg_buf.write_int16(len(external_params))
-
-                    external_params.sort()
-                    for _, i_int in external_params:
-                        oid = data_internal[i_int * 4:(i_int + 1) * 4]
-                        msg_buf.write_bytes(oid)
+                    msg_buf.write_int16(external_params)
+                    msg_buf.write_bytes(data_internal[0:external_params * 4])
 
                     buf.write_buffer(msg_buf.end_message())
 

edb/server/protocol/pg_ext.pyx

@@ -1585,7 +1585,8 @@ cdef WriteBuffer remap_arguments(
     cdef:
         int16_t param_format_count
         int32_t offset
-        int16_t max_external_used
+        int32_t arg_offset_external
+        int16_t param_count_external
         int32_t size
 
     # The "external" parameters (that are visible to the user)
@@ -1621,30 +1622,40 @@ cdef WriteBuffer remap_arguments(
     offset += param_format_count * 2
 
     # find positions of external args
-    param_count_external = read_int16(data[offset:offset+2])
+    arg_count_external = read_int16(data[offset:offset+2])
     offset += 2
-    param_pos_external = []
-    for p in range(param_count_external):
+    arg_offset_external = offset
+    for p in range(arg_count_external):
         size = read_int32(data[offset:offset+4])
         if size == -1:  # special case: NULL
             size = 0
         size += 4 # for size which is int32
-        param_pos_external.append((offset, size))
         offset += size
 
     # write remapped args
-    max_external_used = 0
     if params:
         buf.write_int16(len(params))
-        for param in params:
-            if isinstance(param, dbstate.SQLParamExternal):
-                # map external arg to internal
-                o, s = param_pos_external[param.index - 1]
-                buf.write_bytes(data[o:o+s])
 
-                if max_external_used < param.index:
-                    max_external_used = param.index
-            elif isinstance(param, dbstate.SQLParamGlobal):
+        param_count_external = 0
+        for i, param in enumerate(params):
+            if not isinstance(param, dbstate.SQLParamExternal):
+                break
+            param_count_external = i + 1
+        if param_count_external != arg_count_external:
+            raise pgerror.new(
+                pgerror.ERROR_PROTOCOL_VIOLATION,
+                f'bind message supplies {arg_count_external} '
+                f'parameters, but prepared statement "" requires '
+                f'{param_count_external}',
+            )
+
+        # write external args
+        if arg_offset_external < offset:
+            buf.write_bytes(data[arg_offset_external:offset])
+
+        # write global's args
+        for param in params[param_count_external:]:
+            if isinstance(param, dbstate.SQLParamGlobal):
                 name = param.global_name
                 setting_name = f'global {name.module}::{name.name}'
                 values = fe_settings.get(setting_name, None)
@@ -1656,14 +1667,7 @@ cdef WriteBuffer remap_arguments(
     else:
         buf.write_int16(0)
 
-    if max_external_used != param_count_external:
-        raise pgerror.new(
-            pgerror.ERROR_PROTOCOL_VIOLATION,
-            f'bind message supplies {param_count_external} '
-            f'parameters, but prepared statement "" requires '
-            f'{max_external_used}',
-        )
-
+    # result format codes
     buf.write_bytes(data[offset:])
     return buf