Bug with two refs on single model

[sirex]

Issue when joining two different references from one table. Example:

    (
        child_standard._id  = "d1ec0813-3dde-436b-8244-d726c1e1d7b4" |
        parent_standard._id = "d1ec0813-3dde-436b-8244-d726c1e1d7b4"
    )
    &
    select(
        _id,
        parent_standard.standard_reference,
        child_standard.standard_reference,
        standard_relation_type.name
    )

Traceback (most recent call last):
  File "spinta/api.py", line 91, in homepage
    return await create_http_response(context, params, request)
  File "spinta/utils/response.py", line 165, in create_http_response
    return await commands.getall(
  File "spinta/commands/read.py", line 96, in getall
    return render(context, request, model, params, rows, action=action)
  File "spinta/renderer.py", line 22, in render
    return commands.render(
  File "spinta/formats/html/commands.py", line 135, in render
    return _render_model(context, request, model, action, params, data, headers)
  File "spinta/formats/html/commands.py", line 239, in _render_model
    ctx = _build_template_context(
  File "spinta/formats/html/commands.py", line 213, in _build_template_context
    rows, empty = _is_empty(rows)
  File "spinta/formats/html/commands.py", line 167, in _is_empty
    row = next(rows)
  File "spinta/utils/nestedstruct.py", line 15, in flatten
    for v in vals:
  File "spinta/commands/read.py", line 84, in <genexpr>
    rows = (
  File "spinta/backends/postgresql/commands/read.py", line 110, in getall
    result = conn.execute(qry)
  File "sqlalchemy/engine/base.py", line 1200, in execute
    return meth(self, multiparams, params, _EMPTY_EXECUTION_OPTS)
  File "sqlalchemy/sql/elements.py", line 313, in _execute_on_connection
    return connection._execute_clauseelement(
  File "sqlalchemy/engine/base.py", line 1389, in _execute_clauseelement
    ret = self._execute_context(
  File "sqlalchemy/engine/base.py", line 1748, in _execute_context
    self._handle_dbapi_exception(
  File "sqlalchemy/engine/base.py", line 1929, in _handle_dbapi_exception
    util.raise_(
  File "sqlalchemy/util/compat.py", line 211, in raise_
    raise exception
  File "sqlalchemy/engine/base.py", line 1705, in _execute_context
    self.dialect.do_execute(
  File "sqlalchemy/engine/default.py", line 716, in do_execute
    cursor.execute(statement, parameters)
sqlalchemy.exc.ProgrammingError:
    (psycopg2.errors.DuplicateAlias) table name "Standard" specified more than once

SELECT
  "RelatedStandard"._id,
  "RelatedStandard"._revision,
  "Standard".standard_reference AS "parent_standard.standard_reference",
  "Standard".standard_reference AS "child_standard.standard_reference",
  "StandardRelationType".name AS "standard_relation_type.name"
FROM "RelatedStandard"
JOIN "Standard" ON "RelatedStandard"."parent_standard._id" = "Standard"._id
JOIN "Standard" ON "RelatedStandard"."child_standard._id" = "Standard"._id
JOIN "StandardRelationType" ON "RelatedStandard"."standard_relation_type._id" = "StandardRelationType"._id
WHERE
  "RelatedStandard"."child_standard._id"  = 'd1ec0813-3dde-436b-8244-d726c1e1d7b4' OR
  "RelatedStandard"."parent_standard._id" = 'd1ec0813-3dde-436b-8244-d726c1e1d7b4'
LIMIT 101

The issue here, that Standard was joined two times, wihout using alias.