def range_from_queryset(
set_ops: typing.Sequence[typing.Tuple[str, pgast.BaseRelation]],
scls: s_obj.Object, *,
env: context.Environment) -> pgast.BaseRangeVar:
if len(set_ops) > 1:
# More than one class table, generate a UNION/EXCEPT clause.
qry = pgast.SelectStmt(
all=True,
larg=set_ops[0][1]
)
for op, rarg in set_ops[1:]:
qry.op, qry.rarg = op, rarg
qry = pgast.SelectStmt(
all=True,
larg=qry
)
qry = qry.larg
rvar = pgast.RangeSubselect(
subquery=qry,
alias=pgast.Alias(
aliasname=env.aliases.get(scls.shortname.name)
)
)
else:
# Just one class table, so return it directly
rvar = set_ops[0][1].from_clause[0]
return rvar
def range_for_material_objtype(objtype: s_objtypes.ObjectType,
path_id: irast.PathId,
*,
include_overlays: bool = True,
env: context.Environment) -> pgast.BaseRangeVar:
from . import pathctx # XXX: fix cycle
objtype = objtype.material_type(env.schema)
objtype_name = objtype.get_name(env.schema)
table_schema_name, table_name = common.get_backend_name(env.schema,
objtype,
catenate=False)
if objtype_name.module == 'schema':
# Redirect all queries to schema tables to edgedbss
table_schema_name = 'edgedbss'
relation = pgast.Relation(
schemaname=table_schema_name,
name=table_name,
path_id=path_id,
)
rvar = pgast.RangeVar(
relation=relation,
alias=pgast.Alias(aliasname=env.aliases.get(objtype_name.name)))
overlays = env.rel_overlays.get(objtype_name)
if overlays and include_overlays:
set_ops = []
qry = pgast.SelectStmt()
qry.from_clause.append(rvar)
pathctx.put_path_value_rvar(qry, path_id, rvar, env=env)
pathctx.put_path_bond(qry, path_id)
set_ops.append(('union', qry))
for op, cte in overlays:
rvar = pgast.RangeVar(
relation=cte,
alias=pgast.Alias(aliasname=env.aliases.get(hint=cte.name)))
qry = pgast.SelectStmt(from_clause=[rvar], )
pathctx.put_path_value_rvar(qry, path_id, rvar, env=env)
pathctx.put_path_bond(qry, path_id)
if op == 'replace':
op = 'union'
set_ops = []
set_ops.append((op, qry))
rvar = range_from_queryset(set_ops, objtype, env=env)
return rvar
def _new_inline_pointer_rvar(
ir_ptr: irast.Pointer,
*,
lateral: bool = True,
ptr_info: pg_types.PointerStorageInfo,
src_rvar: pgast.BaseRangeVar,
ctx: context.CompilerContextLevel) -> pgast.BaseRangeVar:
ptr_rel = pgast.SelectStmt()
ptr_rvar = dbobj.rvar_for_rel(ptr_rel, lateral=lateral, env=ctx.env)
ptr_rvar.query.path_id = ir_ptr.target.path_id.ptr_path()
is_inbound = ir_ptr.direction == s_pointers.PointerDirection.Inbound
if is_inbound:
far_pid = ir_ptr.source.path_id
else:
far_pid = ir_ptr.target.path_id
far_ref = pathctx.get_rvar_path_identity_var(src_rvar,
far_pid,
env=ctx.env)
pathctx.put_rvar_path_bond(ptr_rvar, far_pid)
pathctx.put_path_identity_var(ptr_rel, far_pid, var=far_ref, env=ctx.env)
return ptr_rvar
def new_empty_rvar(
ir_set: irast.EmptySet, *,
ctx: context.CompilerContextLevel) -> pgast.BaseRangeVar:
nullref_alias = ctx.env.aliases.get('e')
val = typecomp.cast(pgast.Constant(val=None, nullable=True),
source_type=ir_set.scls, target_type=ir_set.scls,
force=True, env=ctx.env)
nullrel = pgast.SelectStmt(
target_list=[
pgast.ResTarget(
val=val,
name=nullref_alias
)
],
nullable=True
)
rvar = dbobj.rvar_for_rel(nullrel, env=ctx.env)
rvar.path_scope.add(ir_set.path_id)
rvar.value_scope.add(ir_set.path_id)
null_ref = pgast.ColumnRef(name=[nullref_alias], nullable=True)
pathctx.put_rvar_path_output(rvar, ir_set.path_id, aspect='value',
var=null_ref, env=ctx.env)
if ir_set.path_id.is_objtype_path():
pathctx.put_rvar_path_output(rvar, ir_set.path_id, aspect='identity',
var=null_ref, env=ctx.env)
return rvar
def top_output_as_value(stmt: pgast.Query, *,
env: context.Environment) -> pgast.Query:
"""Finalize output serialization on the top level."""
if env.output_format == context.OutputFormat.JSON:
# For JSON we just want to aggregate the whole thing
# into a JSON array.
subrvar = pgast.RangeSubselect(
subquery=stmt,
alias=pgast.Alias(aliasname=env.aliases.get('aggw')))
stmt_res = stmt.target_list[0]
if stmt_res.name is None:
stmt_res.name = env.aliases.get('v')
new_val = pgast.FuncCall(name=('json_agg', ),
args=[pgast.ColumnRef(name=[stmt_res.name])])
# XXX: nullability introspection is not reliable,
# remove `True or` once it is.
if True or stmt_res.val.nullable:
new_val = pgast.CoalesceExpr(
args=[new_val, pgast.Constant(val='[]')])
result = pgast.SelectStmt(target_list=[pgast.ResTarget(val=new_val)],
from_clause=[subrvar])
result.ctes = stmt.ctes
stmt.ctes = []
return result
else:
return stmt
def array_as_json_object(expr, *, stype, env):
if stype.element_type.is_tuple():
coldeflist = []
json_args = []
is_named = stype.element_type.named
for n, st in stype.element_type.iter_subtypes():
colname = env.aliases.get(str(n))
if is_named:
json_args.append(pgast.StringConstant(val=n))
val = pgast.ColumnRef(name=[colname])
if st.is_collection():
val = coll_as_json_object(val, stype=st, env=env)
json_args.append(val)
coldeflist.append(
pgast.ColumnDef(
name=colname,
typename=pgast.TypeName(
name=pgtypes.pg_type_from_object(env.schema, st))))
if is_named:
json_func = 'jsonb_build_object'
else:
json_func = 'jsonb_build_array'
return pgast.SelectStmt(target_list=[
pgast.ResTarget(
val=pgast.FuncCall(name=('jsonb_agg', ),
args=[
pgast.FuncCall(
name=(json_func, ),
args=json_args,
)
]),
ser_safe=True,
)
],
from_clause=[
pgast.RangeFunction(
alias=pgast.Alias(
aliasname=env.aliases.get('q'), ),
coldeflist=coldeflist,
functions=[
pgast.FuncCall(
name=('unnest', ),
args=[expr],
)
])
])
else:
return pgast.FuncCall(name=('to_jsonb', ),
args=[expr],
null_safe=True,
ser_safe=True)
def new_static_class_rvar(
ir_set: irast.Set, *,
lateral: bool=True,
ctx: context.CompilerContextLevel) -> pgast.BaseRangeVar:
set_rvar = new_root_rvar(ir_set, ctx=ctx)
clsname = pgast.Constant(val=ir_set.rptr.source.scls.material_type().name)
nameref = dbobj.get_column(
set_rvar, common.edgedb_name_to_pg_name('schema::name'))
condition = astutils.new_binop(nameref, clsname, op='=')
substmt = pgast.SelectStmt()
include_rvar(substmt, set_rvar, ir_set.path_id, ctx=ctx)
substmt.where_clause = astutils.extend_binop(
substmt.where_clause, condition)
return new_rel_rvar(ir_set, substmt, ctx=ctx)
def new_static_class_rvar(
ir_set: irast.Set, *,
lateral: bool=True,
ctx: context.CompilerContextLevel) -> pgast.BaseRangeVar:
set_rvar = new_root_rvar(ir_set, ctx=ctx)
clsname = pgast.StringConstant(
val=ir_set.rptr.source.stype.material_type(ctx.env.schema).get_name(
ctx.env.schema))
nameref = dbobj.get_column(set_rvar, 'name', nullable=False)
condition = astutils.new_binop(nameref, clsname, op='=')
substmt = pgast.SelectStmt()
include_rvar(substmt, set_rvar, ir_set.path_id, ctx=ctx)
substmt.where_clause = astutils.extend_binop(
substmt.where_clause, condition)
return new_rel_rvar(ir_set, substmt, ctx=ctx)
def range_for_objtype(objtype: s_objtypes.ObjectType,
path_id: irast.PathId,
*,
include_overlays: bool = True,
env: context.Environment) -> pgast.BaseRangeVar:
from . import pathctx # XXX: fix cycle
if not objtype.is_virtual:
rvar = range_for_material_objtype(objtype,
path_id,
include_overlays=include_overlays,
env=env)
else:
# Union object types are represented as a UNION of selects
# from their children, which is, for most purposes, equivalent
# to SELECTing from a parent table.
children = frozenset(objtype.children(env.schema))
set_ops = []
for child in children:
c_rvar = range_for_objtype(child,
path_id=path_id,
include_overlays=include_overlays,
env=env)
qry = pgast.SelectStmt(from_clause=[c_rvar], )
pathctx.put_path_value_rvar(qry, path_id, c_rvar, env=env)
qry.path_scope.add(path_id)
set_ops.append(('union', qry))
rvar = range_from_queryset(set_ops, objtype, env=env)
rvar.query.is_distinct = True
rvar.query.path_id = path_id
return rvar
def cast(node: pgast.Base,
*,
source_type: s_obj.Object,
target_type: s_obj.Object,
force: bool = False,
env: context.Environment) -> pgast.Base:
if source_type.name == target_type.name and not force:
return node
schema = env.schema
real_t = schema.get('std::anyreal')
int_t = schema.get('std::anyint')
json_t = schema.get('std::json')
str_t = schema.get('std::str')
datetime_t = schema.get('std::datetime')
bool_t = schema.get('std::bool')
if isinstance(target_type, s_types.Collection):
if target_type.schema_name == 'array':
if source_type.issubclass(json_t):
# If we are casting a jsonb array to array, we do the
# following transformation:
# EdgeQL: <array<T>>MAP_VALUE
# SQL:
# SELECT array_agg(j::T)
# FROM jsonb_array_elements(MAP_VALUE) AS j
inner_cast = cast(pgast.ColumnRef(name=['j']),
source_type=source_type,
target_type=target_type.element_type,
env=env)
return pgast.SelectStmt(
target_list=[
pgast.ResTarget(val=pgast.FuncCall(
name=('array_agg', ), args=[inner_cast]))
],
from_clause=[
pgast.RangeFunction(functions=[
pgast.FuncCall(name=('jsonb_array_elements', ),
args=[node])
],
alias=pgast.Alias(aliasname='j'))
])
else:
# EdgeQL: <array<int64>>['1', '2']
# to SQL: ARRAY['1', '2']::int[]
elem_pgtype = pg_types.pg_type_from_object(
schema, target_type.element_type, topbase=True)
return pgast.TypeCast(arg=node,
type_name=pgast.TypeName(
name=elem_pgtype, array_bounds=[-1]))
else:
# `target_type` is not a collection.
if (source_type.issubclass(datetime_t)
and target_type.issubclass(str_t)):
# Normalize datetime to text conversion to have the same
# format as one would get by serializing to JSON.
#
# EdgeQL: <text><datetime>'2010-10-10';
# To SQL: trim(to_json('2010-01-01'::timestamptz)::text, '"')
return pgast.FuncCall(
name=('trim', ),
args=[
pgast.TypeCast(arg=pgast.FuncCall(name=('to_json', ),
args=[node]),
type_name=pgast.TypeName(name=('text', ))),
pgast.Constant(val='"')
])
elif source_type.issubclass(bool_t) and target_type.issubclass(int_t):
# PostgreSQL 9.6 doesn't allow to cast 'boolean' to any integer
# other than int32:
# SELECT 'true'::boolean::bigint;
# ERROR: cannot cast type boolean to bigint
# So we transform EdgeQL: <int64>BOOL
# to SQL: BOOL::int::<targetint>
return pgast.TypeCast(
arg=pgast.TypeCast(arg=node,
type_name=pgast.TypeName(name=('int', ))),
type_name=pgast.TypeName(
name=pg_types.pg_type_from_scalar(schema, target_type)))
elif source_type.issubclass(int_t) and target_type.issubclass(bool_t):
# PostgreSQL 9.6 doesn't allow to cast any integer other
# than int32 to 'boolean':
# SELECT 1::bigint::boolean;
# ERROR: cannot cast type bigint to boolea
# So we transform EdgeQL: <boolean>INT
# to SQL: (INT != 0)
return astutils.new_binop(node,
pgast.Constant(val=0),
op=ast.ops.NE)
elif source_type.issubclass(json_t):
if (target_type.issubclass(real_t)
or target_type.issubclass(bool_t)):
# Simply cast to text and the to the target type.
return cast(cast(node,
source_type=source_type,
target_type=str_t,
env=env),
source_type=str_t,
target_type=target_type,
env=env)
elif target_type.issubclass(str_t):
# It's not possible to cast jsonb string to text directly,
# so we do a trick:
# EdgeQL: <str>JSONB_VAL
# SQL: array_to_json(ARRAY[JSONB_VAL])->>0
return astutils.new_binop(pgast.FuncCall(
name=('array_to_json', ),
args=[pgast.ArrayExpr(elements=[node])]),
pgast.Constant(val=0),
op='->>')
elif target_type.issubclass(json_t):
return pgast.TypeCast(
arg=node, type_name=pgast.TypeName(name=('jsonb', )))
else:
const_type = pg_types.pg_type_from_object(schema,
target_type,
topbase=True)
return pgast.TypeCast(arg=node,
type_name=pgast.TypeName(name=const_type))
raise RuntimeError(
f'could not cast {source_type.name} to {target_type.name}')
def process_link_update(
ir_stmt: irast.MutatingStmt, ir_expr: irast.Base, props_only: bool,
wrapper: pgast.Query, dml_cte: pgast.CommonTableExpr,
iterator_cte: pgast.CommonTableExpr, *,
ctx: context.CompilerContextLevel) -> typing.Optional[pgast.Query]:
"""Perform updates to a link relation as part of a DML statement.
:param ir_stmt:
IR of the statement.
:param ir_expr:
IR of the INSERT/UPDATE body element.
:param props_only:
Whether this link update only touches link properties.
:param wrapper:
Top-level SQL query.
:param dml_cte:
CTE representing the SQL INSERT or UPDATE to the main
relation of the Object.
:param iterator_cte:
CTE representing the iterator range in the FOR clause of the
EdgeQL DML statement.
"""
toplevel = ctx.toplevel_stmt
edgedb_ptr_tab = pgast.RangeVar(
relation=pgast.Relation(schemaname='edgedb', name='pointer'),
alias=pgast.Alias(aliasname=ctx.env.aliases.get(hint='ptr')))
ltab_alias = edgedb_ptr_tab.alias.aliasname
rptr = ir_expr.rptr
ptrcls = rptr.ptrcls
target_is_scalar = isinstance(ptrcls.target, s_scalars.ScalarType)
path_id = rptr.source.path_id.extend(ptrcls, rptr.direction,
rptr.target.scls)
# The links in the dml class shape have been derived,
# but we must use the correct specialized link class for the
# base material type.
mptrcls = ptrcls.material_type()
# Lookup link class id by link name.
lname_to_id = pgast.CommonTableExpr(query=pgast.SelectStmt(
from_clause=[edgedb_ptr_tab],
target_list=[
pgast.ResTarget(val=pgast.ColumnRef(name=[ltab_alias, 'id']))
],
where_clause=astutils.new_binop(
lexpr=pgast.ColumnRef(name=[ltab_alias, 'name']),
rexpr=pgast.Constant(val=mptrcls.name),
op=ast.ops.EQ)),
name=ctx.env.aliases.get(hint='lid'))
lname_to_id_rvar = pgast.RangeVar(relation=lname_to_id)
toplevel.ctes.append(lname_to_id)
target_rvar = dbobj.range_for_ptrcls(mptrcls,
'>',
include_overlays=False,
env=ctx.env)
target_alias = target_rvar.alias.aliasname
target_tab_name = (target_rvar.relation.schemaname,
target_rvar.relation.name)
tab_cols = dbobj.cols_for_pointer(mptrcls, env=ctx.env)
dml_cte_rvar = pgast.RangeVar(
relation=dml_cte,
alias=pgast.Alias(aliasname=ctx.env.aliases.get('m')))
col_data = {
'ptr_item_id':
pgast.ColumnRef(name=[lname_to_id.name, 'id']),
'std::source':
pathctx.get_rvar_path_identity_var(dml_cte_rvar,
ir_stmt.subject.path_id,
env=ctx.env)
}
# Drop all previous link records for this source.
delcte = pgast.CommonTableExpr(query=pgast.DeleteStmt(
relation=target_rvar,
where_clause=astutils.new_binop(
lexpr=col_data['std::source'],
op=ast.ops.EQ,
rexpr=pgast.ColumnRef(name=[target_alias, 'std::source'])),
using_clause=[dml_cte_rvar],
returning_list=[
pgast.ResTarget(val=pgast.ColumnRef(
name=[target_alias, pgast.Star()]))
]),
name=ctx.env.aliases.get(hint='d'))
pathctx.put_path_value_rvar(delcte.query,
path_id.ptr_path(),
target_rvar,
env=ctx.env)
# Record the effect of this removal in the relation overlay
# context to ensure that the RETURNING clause potentially
# referencing this link yields the expected results.
overlays = ctx.env.rel_overlays[ptrcls.shortname]
overlays.append(('except', delcte))
toplevel.ctes.append(delcte)
# Turn the IR of the expression on the right side of :=
# into a subquery returning records for the link table.
data_cte, specified_cols = process_link_values(ir_stmt,
ir_expr,
target_tab_name,
tab_cols,
col_data,
dml_cte_rvar,
[lname_to_id_rvar],
props_only,
target_is_scalar,
iterator_cte,
ctx=ctx)
toplevel.ctes.append(data_cte)
data_select = pgast.SelectStmt(
target_list=[
pgast.ResTarget(val=pgast.ColumnRef(
name=[data_cte.name, pgast.Star()]))
],
from_clause=[pgast.RangeVar(relation=data_cte)])
# Inserting rows into the link table may produce cardinality
# constraint violations, since the INSERT into the link table
# is executed in the snapshot where the above DELETE from
# the link table is not visible. Hence, we need to use
# the ON CONFLICT clause to resolve this.
conflict_cols = ['std::source', 'std::target', 'ptr_item_id']
conflict_inference = []
conflict_exc_row = []
for col in conflict_cols:
conflict_inference.append(pgast.ColumnRef(name=[col]))
conflict_exc_row.append(pgast.ColumnRef(name=['excluded', col]))
conflict_data = pgast.SelectStmt(
target_list=[
pgast.ResTarget(val=pgast.ColumnRef(
name=[data_cte.name, pgast.Star()]))
],
from_clause=[pgast.RangeVar(relation=data_cte)],
where_clause=astutils.new_binop(
lexpr=pgast.ImplicitRowExpr(args=conflict_inference),
rexpr=pgast.ImplicitRowExpr(args=conflict_exc_row),
op='='))
cols = [pgast.ColumnRef(name=[col]) for col in specified_cols]
updcte = pgast.CommonTableExpr(
name=ctx.env.aliases.get(hint='i'),
query=pgast.InsertStmt(
relation=target_rvar,
select_stmt=data_select,
cols=cols,
on_conflict=pgast.OnConflictClause(
action='update',
infer=pgast.InferClause(index_elems=conflict_inference),
target_list=[
pgast.MultiAssignRef(columns=cols, source=conflict_data)
]),
returning_list=[
pgast.ResTarget(val=pgast.ColumnRef(name=[pgast.Star()]))
]))
pathctx.put_path_value_rvar(updcte.query,
path_id.ptr_path(),
target_rvar,
env=ctx.env)
# Record the effect of this insertion in the relation overlay
# context to ensure that the RETURNING clause potentially
# referencing this link yields the expected results.
overlays = ctx.env.rel_overlays[ptrcls.shortname]
overlays.append(('union', updcte))
toplevel.ctes.append(updcte)
return data_cte
def process_update_body(ir_stmt: irast.MutatingStmt, wrapper: pgast.Query,
update_cte: pgast.CommonTableExpr,
range_cte: pgast.CommonTableExpr, *,
ctx: context.CompilerContextLevel):
"""Generate SQL DML CTEs from an UpdateStmt IR.
:param ir_stmt:
IR of the statement.
:param wrapper:
Top-level SQL query.
:param update_cte:
CTE representing the SQL UPDATE to the main relation of the Object.
:param range_cte:
CTE representing the range affected by the statement.
"""
update_stmt = update_cte.query
external_updates = []
toplevel = ctx.toplevel_stmt
toplevel.ctes.append(range_cte)
toplevel.ctes.append(update_cte)
with ctx.newscope() as subctx:
# It is necessary to process the expressions in
# the UpdateStmt shape body in the context of the
# UPDATE statement so that references to the current
# values of the updated object are resolved correctly.
subctx.path_scope[ir_stmt.subject.path_id] = update_stmt
subctx.rel = update_stmt
subctx.expr_exposed = False
subctx.shape_format = context.ShapeFormat.FLAT
for shape_el in ir_stmt.subject.shape:
with subctx.newscope() as scopectx:
ptrcls = shape_el.rptr.ptrcls
updvalue = shape_el.expr
ptr_info = pg_types.get_pointer_storage_info(
ptrcls,
schema=scopectx.env.schema,
resolve_type=True,
link_bias=False)
# First, process all internal link updates
if ptr_info.table_type == 'ObjectType':
updvalue = pgast.TypeCast(
arg=dispatch.compile(updvalue, ctx=scopectx),
type_name=typecomp.type_node(ptr_info.column_type))
update_stmt.targets.append(
pgast.UpdateTarget(name=ptr_info.column_name,
val=updvalue))
props_only = is_props_only_update(shape_el)
ptr_info = pg_types.get_pointer_storage_info(ptrcls,
resolve_type=False,
link_bias=True)
if ptr_info and ptr_info.table_type == 'link':
external_updates.append((shape_el, props_only))
if not update_stmt.targets:
# No updates directly to the set target table,
# so convert the UPDATE statement into a SELECT.
update_cte.query = pgast.SelectStmt(
ctes=update_stmt.ctes,
target_list=update_stmt.returning_list,
from_clause=[update_stmt.relation] + update_stmt.from_clause,
where_clause=update_stmt.where_clause,
path_namespace=update_stmt.path_namespace,
path_outputs=update_stmt.path_outputs,
path_scope=update_stmt.path_scope,
path_rvar_map=update_stmt.path_rvar_map.copy(),
view_path_id_map=update_stmt.view_path_id_map.copy(),
ptr_join_map=update_stmt.ptr_join_map.copy(),
)
# Process necessary updates to the link tables.
for expr, props_only in external_updates:
if props_only:
process_linkprop_update(ir_stmt,
expr,
wrapper,
update_cte,
ctx=ctx)
else:
process_link_update(ir_stmt,
expr,
False,
wrapper,
update_cte,
None,
ctx=ctx)
def process_insert_body(ir_stmt: irast.MutatingStmt, wrapper: pgast.Query,
insert_cte: pgast.CommonTableExpr,
insert_rvar: pgast.BaseRangeVar, *,
ctx: context.CompilerContextLevel) -> None:
"""Generate SQL DML CTEs from an InsertStmt IR.
:param ir_stmt:
IR of the statement.
:param wrapper:
Top-level SQL query.
:param insert_cte:
CTE representing the SQL INSERT to the main relation of the Object.
"""
cols = [pgast.ColumnRef(name=['std::__type__'])]
select = pgast.SelectStmt(target_list=[])
values = select.target_list
# The main INSERT query of this statement will always be
# present to insert at least the std::id and std::__type__
# links.
insert_stmt = insert_cte.query
insert_stmt.cols = cols
insert_stmt.select_stmt = select
if ir_stmt.parent_stmt is not None:
iterator_set = ir_stmt.parent_stmt.iterator_stmt
else:
iterator_set = None
if iterator_set is not None:
with ctx.substmt() as ictx:
ictx.path_scope = ictx.path_scope.new_child()
ictx.path_scope[iterator_set.path_id] = ictx.rel
clauses.compile_iterator_expr(ictx.rel, iterator_set, ctx=ictx)
ictx.rel.path_id = iterator_set.path_id
pathctx.put_path_bond(ictx.rel, iterator_set.path_id)
iterator_cte = pgast.CommonTableExpr(
query=ictx.rel, name=ctx.env.aliases.get('iter'))
ictx.toplevel_stmt.ctes.append(iterator_cte)
iterator_rvar = dbobj.rvar_for_rel(iterator_cte, env=ctx.env)
relctx.include_rvar(select,
iterator_rvar,
path_id=ictx.rel.path_id,
ctx=ctx)
iterator_id = pathctx.get_path_identity_var(select,
iterator_set.path_id,
env=ctx.env)
else:
iterator_cte = None
iterator_id = None
values.append(
pgast.ResTarget(val=pgast.SelectStmt(
target_list=[pgast.ResTarget(val=pgast.ColumnRef(name=['id']))],
from_clause=[
pgast.RangeVar(relation=pgast.Relation(name='objecttype',
schemaname='edgedb'))
],
where_clause=astutils.new_binop(
op=ast.ops.EQ,
lexpr=pgast.ColumnRef(name=['name']),
rexpr=pgast.Constant(val=ir_stmt.subject.scls.shortname)))))
external_inserts = []
tuple_elements = []
parent_link_props = []
with ctx.newrel() as subctx:
subctx.rel = select
subctx.rel_hierarchy[select] = insert_stmt
subctx.expr_exposed = False
subctx.shape_format = context.ShapeFormat.FLAT
if iterator_cte is not None:
subctx.path_scope = ctx.path_scope.new_child()
subctx.path_scope[iterator_cte.query.path_id] = select
# Process the Insert IR and separate links that go
# into the main table from links that are inserted into
# a separate link table.
for shape_el in ir_stmt.subject.shape:
rptr = shape_el.rptr
ptrcls = rptr.ptrcls.material_type()
if (ptrcls.is_link_property()
and rptr.source.path_id != ir_stmt.subject.path_id):
parent_link_props.append(shape_el)
continue
ptr_info = pg_types.get_pointer_storage_info(
ptrcls,
schema=subctx.env.schema,
resolve_type=True,
link_bias=False)
props_only = False
# First, process all local link inserts.
if ptr_info.table_type == 'ObjectType':
props_only = True
field = pgast.ColumnRef(name=[ptr_info.column_name])
cols.append(field)
insvalue = insert_value_for_shape_element(insert_stmt,
wrapper,
ir_stmt,
shape_el,
iterator_id,
ptr_info=ptr_info,
ctx=subctx)
tuple_el = astutils.tuple_element_for_shape_el(shape_el, field)
tuple_elements.append(tuple_el)
values.append(pgast.ResTarget(val=insvalue))
ptr_info = pg_types.get_pointer_storage_info(ptrcls,
resolve_type=False,
link_bias=True)
if ptr_info and ptr_info.table_type == 'link':
external_inserts.append((shape_el, props_only))
if iterator_cte is not None:
cols.append(pgast.ColumnRef(name=['__edb_token']))
values.append(pgast.ResTarget(val=iterator_id))
pathctx.put_path_identity_var(insert_stmt,
iterator_set.path_id,
cols[-1],
force=True,
env=subctx.env)
pathctx.put_path_bond(insert_stmt, iterator_set.path_id)
toplevel = ctx.toplevel_stmt
toplevel.ctes.append(insert_cte)
# Process necessary updates to the link tables.
for shape_el, props_only in external_inserts:
process_link_update(ir_stmt,
shape_el,
props_only,
wrapper,
insert_cte,
iterator_cte,
ctx=ctx)
if parent_link_props:
prop_elements = []
with ctx.newscope() as scopectx:
scopectx.rel = wrapper
for shape_el in parent_link_props:
rptr = shape_el.rptr
scopectx.path_scope[rptr.source.path_id] = wrapper
pathctx.put_path_rvar_if_not_exists(wrapper,
rptr.source.path_id,
insert_rvar,
aspect='value',
env=scopectx.env)
dispatch.compile(shape_el, ctx=scopectx)
tuple_el = astutils.tuple_element_for_shape_el(shape_el, None)
prop_elements.append(tuple_el)
valtuple = pgast.TupleVar(elements=prop_elements, named=True)
pathctx.put_path_value_var(wrapper,
ir_stmt.subject.path_id,
valtuple,
force=True,
env=ctx.env)
def __init__(self, prevlevel, mode):
if prevlevel is None:
self.env = None
self.argmap = collections.OrderedDict()
self.toplevel_stmt = None
self.stmt = None
self.rel = None
self.rel_hierarchy = {}
self.pending_query = None
self.clause = None
self.toplevel_clause = None
self.expr_exposed = None
self.volatility_ref = None
self.group_by_rels = {}
self.disable_semi_join = set()
self.unique_paths = set()
self.force_optional = set()
self.path_scope = collections.ChainMap()
self.scope_tree = None
else:
self.env = prevlevel.env
self.argmap = prevlevel.argmap
self.toplevel_stmt = prevlevel.toplevel_stmt
self.stmt = prevlevel.stmt
self.rel = prevlevel.rel
self.rel_hierarchy = prevlevel.rel_hierarchy
self.pending_query = prevlevel.pending_query
self.clause = prevlevel.clause
self.toplevel_clause = prevlevel.toplevel_clause
self.expr_exposed = prevlevel.expr_exposed
self.volatility_ref = prevlevel.volatility_ref
self.group_by_rels = prevlevel.group_by_rels
self.disable_semi_join = prevlevel.disable_semi_join.copy()
self.unique_paths = prevlevel.unique_paths.copy()
self.force_optional = prevlevel.force_optional.copy()
self.path_scope = prevlevel.path_scope
self.scope_tree = prevlevel.scope_tree
if mode in {
ContextSwitchMode.SUBREL, ContextSwitchMode.NEWREL,
ContextSwitchMode.SUBSTMT
}:
if self.pending_query and mode == ContextSwitchMode.SUBSTMT:
self.rel = self.pending_query
else:
self.rel = pgast.SelectStmt()
if mode != ContextSwitchMode.NEWREL:
self.rel_hierarchy[self.rel] = prevlevel.rel
self.pending_query = None
self.clause = 'result'
if mode == ContextSwitchMode.SUBSTMT:
self.stmt = self.rel
if mode == ContextSwitchMode.NEWSCOPE:
self.path_scope = prevlevel.path_scope.new_child()
def range_for_ptrcls(
ptrcls: s_links.Link, direction: s_pointers.PointerDirection, *,
include_overlays: bool=True,
env: context.Environment) -> pgast.BaseRangeVar:
""""Return a Range subclass corresponding to a given ptr step.
If `ptrcls` is a generic link, then a simple RangeVar is returned,
otherwise the return value may potentially be a UNION of all tables
corresponding to a set of specialized links computed from the given
`ptrcls` taking source inheritance into account.
"""
linkname = ptrcls.shortname
endpoint = ptrcls.source
tgt_col = pgtypes.get_pointer_storage_info(
ptrcls, resolve_type=False, link_bias=True).column_name
cols = [
'std::source',
tgt_col
]
set_ops = []
ptrclses = set()
for source in {endpoint} | set(endpoint.descendants(env.schema)):
# Sift through the descendants to see who has this link
try:
src_ptrcls = source.pointers[linkname].material_type()
except KeyError:
# This source has no such link, skip it
continue
else:
if src_ptrcls in ptrclses:
# Seen this link already
continue
ptrclses.add(src_ptrcls)
table = table_from_ptrcls(src_ptrcls, env=env)
qry = pgast.SelectStmt()
qry.from_clause.append(table)
qry.rptr_rvar = table
# Make sure all property references are pulled up properly
for colname in cols:
selexpr = pgast.ColumnRef(
name=[table.alias.aliasname, colname])
qry.target_list.append(
pgast.ResTarget(val=selexpr, name=colname))
set_ops.append(('union', qry))
overlays = env.rel_overlays.get(src_ptrcls.shortname)
if overlays and include_overlays:
for op, cte in overlays:
rvar = pgast.RangeVar(
relation=cte,
alias=pgast.Alias(
aliasname=env.aliases.get(cte.name)
)
)
qry = pgast.SelectStmt(
target_list=[
pgast.ResTarget(
val=pgast.ColumnRef(
name=[col]
)
)
for col in cols
],
from_clause=[rvar],
)
set_ops.append((op, qry))
rvar = range_from_queryset(set_ops, ptrcls, env=env)
return rvar
