>From 20960ee030b0bd59c72ebb42bedb359b4cd7e31d Mon Sep 17 00:00:00 2001 From: Alvaro Herrera Date: Fri, 25 Apr 2014 16:43:53 -0300 Subject: [PATCH 16/44] deparse: Support for ALTER RENAME --- src/backend/tcop/deparse_utility.c | 413 ++++++++++++++++++++++++++++++++++++- 1 file changed, 412 insertions(+), 1 deletion(-) diff --git a/src/backend/tcop/deparse_utility.c b/src/backend/tcop/deparse_utility.c index 2fe3c81..06ca71c 100644 --- a/src/backend/tcop/deparse_utility.c +++ b/src/backend/tcop/deparse_utility.c @@ -40,6 +40,8 @@ #include "catalog/pg_inherits.h" #include "catalog/pg_operator.h" #include "catalog/pg_opclass.h" +#include "catalog/pg_opfamily.h" +#include "catalog/pg_policy.h" #include "catalog/pg_proc.h" #include "catalog/pg_range.h" #include "catalog/pg_rewrite.h" @@ -126,6 +128,7 @@ static void append_integer_object(ObjTree *tree, char *name, int64 value); static void append_float_object(ObjTree *tree, char *name, float8 value); static inline void append_premade_object(ObjTree *tree, ObjElem *elem); static JsonbValue *objtree_to_jsonb_rec(ObjTree *tree, JsonbParseState *state); +static const char *stringify_objtype(ObjectType objtype); /* * Allocate a new object tree to store parameter values. @@ -1640,6 +1643,414 @@ deparse_CreateRangeStmt(Oid objectId, Node *parsetree) return range; } +/* + * Return the given object type as a string. + */ +static const char * +stringify_objtype(ObjectType objtype) +{ + switch (objtype) + { + case OBJECT_AGGREGATE: + return "AGGREGATE"; + case OBJECT_CAST: + return "CAST"; + case OBJECT_COLUMN: + return "COLUMN"; + case OBJECT_COLLATION: + return "COLLATION"; + case OBJECT_CONVERSION: + return "CONVERSION"; + case OBJECT_DATABASE: + return "DATABASE"; + case OBJECT_DOMAIN: + return "DOMAIN"; + case OBJECT_EVENT_TRIGGER: + return "EVENT TRIGGER"; + case OBJECT_EXTENSION: + return "EXTENSION"; + case OBJECT_FDW: + return "FOREIGN DATA WRAPPER"; + case OBJECT_FOREIGN_SERVER: + return "SERVER"; + case OBJECT_FOREIGN_TABLE: + return "FOREIGN TABLE"; + case OBJECT_FUNCTION: + return "FUNCTION"; + case OBJECT_INDEX: + return "INDEX"; + case OBJECT_LANGUAGE: + return "LANGUAGE"; + case OBJECT_LARGEOBJECT: + return "LARGE OBJECT"; + case OBJECT_MATVIEW: + return "MATERIALIZED VIEW"; + case OBJECT_OPCLASS: + return "OPERATOR CLASS"; + case OBJECT_OPERATOR: + return "OPERATOR"; + case OBJECT_OPFAMILY: + return "OPERATOR FAMILY"; + case OBJECT_ROLE: + return "ROLE"; + case OBJECT_RULE: + return "RULE"; + case OBJECT_SCHEMA: + return "SCHEMA"; + case OBJECT_SEQUENCE: + return "SEQUENCE"; + case OBJECT_TABLE: + return "TABLE"; + case OBJECT_TABLESPACE: + return "TABLESPACE"; + case OBJECT_TRIGGER: + return "TRIGGER"; + case OBJECT_TSCONFIGURATION: + return "TEXT SEARCH CONFIGURATION"; + case OBJECT_TSDICTIONARY: + return "TEXT SEARCH DICTIONARY"; + case OBJECT_TSPARSER: + return "TEXT SEARCH PARSER"; + case OBJECT_TSTEMPLATE: + return "TEXT SEARCH TEMPLATE"; + case OBJECT_TYPE: + return "TYPE"; + case OBJECT_USER_MAPPING: + return "USER MAPPING"; + case OBJECT_VIEW: + return "VIEW"; + + default: + elog(ERROR, "unsupported objtype %d", objtype); + } +} + +static ObjTree * +deparse_RenameStmt(Oid objectId, Node *parsetree) +{ + RenameStmt *node = (RenameStmt *) parsetree; + ObjTree *renameStmt; + char *fmtstr; + Relation relation; + Oid schemaId; + + /* + * FIXME --- this code is missing support for inheritance behavioral flags, + * i.e. the "*" and ONLY elements. + */ + + /* + * In a ALTER .. RENAME command, we don't have the original name of the + * object in system catalogs: since we inspect them after the command has + * executed, the old name is already gone. Therefore, we extract it from + * the parse node. Note we still extract the schema name from the catalog + * (it might not be present in the parse node); it cannot possibly have + * changed anyway. + * + * XXX what if there's another event trigger running concurrently that + * renames the schema or moves the object to another schema? Seems + * pretty far-fetched, but possible nonetheless. + */ + switch (node->renameType) + { + case OBJECT_TABLE: + case OBJECT_SEQUENCE: + case OBJECT_VIEW: + case OBJECT_MATVIEW: + case OBJECT_INDEX: + case OBJECT_FOREIGN_TABLE: + fmtstr = psprintf("ALTER %s %%{if_exists}s %%{identity}D RENAME TO %%{newname}I", + stringify_objtype(node->renameType)); + relation = relation_open(objectId, AccessShareLock); + schemaId = RelationGetNamespace(relation); + renameStmt = new_objtree_VA(fmtstr, 0); + append_object_object(renameStmt, "identity", + new_objtree_for_qualname(schemaId, + node->relation->relname)); + append_string_object(renameStmt, "if_exists", + node->missing_ok ? "IF EXISTS" : ""); + relation_close(relation, AccessShareLock); + break; + + case OBJECT_COLUMN: + relation = relation_open(objectId, AccessShareLock); + schemaId = RelationGetNamespace(relation); + + if (node->relationType == OBJECT_TYPE) + { + + fmtstr = psprintf("ALTER TYPE %%{identity}D RENAME ATTRIBUTE %%{colname}I TO %%{newname}I"); + renameStmt = new_objtree_VA(fmtstr, 0); + } + else + { + fmtstr = psprintf("ALTER %s %%{if_exists}s %%{identity}D RENAME COLUMN %%{colname}I TO %%{newname}I", + stringify_objtype(node->relationType)); + } + + renameStmt = new_objtree_VA(fmtstr, 0); + + append_object_object(renameStmt, "identity", + new_objtree_for_qualname(schemaId, + node->relation->relname)); + append_string_object(renameStmt, "colname", node->subname); + + /* composite types do not support IF EXISTS */ + if (node->relationType != OBJECT_TYPE) + append_string_object(renameStmt, "if_exists", + node->missing_ok ? "IF EXISTS" : ""); + relation_close(relation, AccessShareLock); + + break; + + case OBJECT_SCHEMA: + { + renameStmt = + new_objtree_VA("ALTER SCHEMA %{identity}I RENAME TO %{newname}I", + 0); + append_string_object(renameStmt, "identity", node->subname); + } + break; + + case OBJECT_FDW: + case OBJECT_LANGUAGE: + case OBJECT_FOREIGN_SERVER: + { + fmtstr = psprintf("ALTER %s %%{identity}s RENAME TO %%{newname}I", + stringify_objtype(node->renameType)); + renameStmt = new_objtree_VA(fmtstr, 0); + append_string_object(renameStmt, "identity", + strVal(linitial(node->object))); + } + break; + + case OBJECT_COLLATION: + case OBJECT_CONVERSION: + case OBJECT_DOMAIN: + case OBJECT_TSDICTIONARY: + case OBJECT_TSPARSER: + case OBJECT_TSTEMPLATE: + case OBJECT_TSCONFIGURATION: + case OBJECT_TYPE: + { + char *identity; + HeapTuple objTup; + Relation catalog; + Datum objnsp; + bool isnull; + Oid classId = get_objtype_catalog_oid(node->renameType); + AttrNumber Anum_namespace = get_object_attnum_namespace(classId); + + catalog = relation_open(classId, AccessShareLock); + objTup = get_catalog_object_by_oid(catalog, objectId); + objnsp = heap_getattr(objTup, Anum_namespace, + RelationGetDescr(catalog), &isnull); + if (isnull) + elog(ERROR, "invalid NULL namespace"); + + identity = psprintf("%s.%s", get_namespace_name(DatumGetObjectId(objnsp)), + strVal(llast(node->object))); + + fmtstr = psprintf("ALTER %s %%{identity}s RENAME TO %%{newname}I", + stringify_objtype(node->renameType)); + renameStmt = new_objtree_VA(fmtstr, 0); + append_string_object(renameStmt, "identity", identity); + + relation_close(catalog, AccessShareLock); + } + break; + + case OBJECT_OPCLASS: + case OBJECT_OPFAMILY: + { + char *identity; + HeapTuple objTup; + HeapTuple amTup; + Relation catalog; + Datum objnsp; + bool isnull; + Oid classId = get_objtype_catalog_oid(node->renameType); + AttrNumber Anum_namespace = get_object_attnum_namespace(classId); + Oid amoid; + + catalog = relation_open(classId, AccessShareLock); + objTup = get_catalog_object_by_oid(catalog, objectId); + objnsp = heap_getattr(objTup, Anum_namespace, + RelationGetDescr(catalog), &isnull); + if (isnull) + elog(ERROR, "invalid NULL namespace"); + + if (node->renameType == OBJECT_OPCLASS) + amoid = ((Form_pg_opclass) GETSTRUCT(objTup))->opcmethod; + else + amoid = ((Form_pg_opfamily) GETSTRUCT(objTup))->opfmethod; + amTup = SearchSysCache1(AMOID, ObjectIdGetDatum(amoid)); + if (!HeapTupleIsValid(amTup)) + elog(ERROR, "cache lookup failed for access method %u", amoid); + + identity = psprintf("%s.%s", get_namespace_name(DatumGetObjectId(objnsp)), + strVal(llast(node->object))); + + fmtstr = psprintf("ALTER %s %%{identity}s USING %%{amname}I RENAME TO %%{newname}I", + stringify_objtype(node->renameType)); + renameStmt = new_objtree_VA(fmtstr, 0); + append_string_object(renameStmt, "identity", identity); + append_string_object(renameStmt, "amname", + pstrdup(NameStr(((Form_pg_am) GETSTRUCT(amTup))->amname))); + + ReleaseSysCache(amTup); + relation_close(catalog, AccessShareLock); + } + + case OBJECT_AGGREGATE: + case OBJECT_FUNCTION: + { + char *newident; + ObjectAddress objaddr; + const char *quoted_newname; + StringInfoData old_ident; + char *start; + + /* + * Generating a function/aggregate identity is altogether too + * messy, so instead of doing it ourselves, we generate one for + * the renamed object, then strip out the name and replace it + * with the original name from the parse node. This is so ugly + * that we don't dare do it for any other object kind. + */ + + objaddr.classId = get_objtype_catalog_oid(node->renameType); + objaddr.objectId = objectId; + objaddr.objectSubId = 0; + newident = getObjectIdentity(&objaddr); + + quoted_newname = quote_identifier(node->newname); + start = strstr(newident, quoted_newname); + if (!start) + elog(ERROR, "could not find %s in %s", start, newident); + initStringInfo(&old_ident); + appendBinaryStringInfo(&old_ident, newident, start - newident); + appendStringInfoString(&old_ident, + quote_identifier(strVal(llast(node->object)))); + appendStringInfoString(&old_ident, start + strlen(quoted_newname)); + + fmtstr = psprintf("ALTER %s %%{identity}s RENAME TO %%{newname}I", + stringify_objtype(node->renameType)); + renameStmt = new_objtree_VA(fmtstr, 1, + "identity", ObjTypeString, old_ident.data); + } + break; + + case OBJECT_TABCONSTRAINT: + case OBJECT_DOMCONSTRAINT: + { + HeapTuple conTup; + Form_pg_constraint constrForm; + ObjTree *ident; + + conTup = SearchSysCache1(CONSTROID, objectId); + constrForm = (Form_pg_constraint) GETSTRUCT(conTup); + + if (node->renameType == OBJECT_TABCONSTRAINT) + { + fmtstr = "ALTER TABLE %{identity}D RENAME CONSTRAINT %{conname}I TO %{newname}I"; + ident = new_objtree_for_qualname_id(RelationRelationId, + constrForm->conrelid); + } + else + { + fmtstr = "ALTER DOMAIN %{identity}D RENAME CONSTRAINT %{conname}I TO %{newname}I"; + ident = new_objtree_for_qualname_id(TypeRelationId, + constrForm->contypid); + } + renameStmt = new_objtree_VA(fmtstr, 2, + "conname", ObjTypeString, node->subname, + "identity", ObjTypeObject, ident); + ReleaseSysCache(conTup); + } + break; + + case OBJECT_RULE: + { + HeapTuple rewrTup; + Form_pg_rewrite rewrForm; + Relation pg_rewrite; + + pg_rewrite = relation_open(RewriteRelationId, AccessShareLock); + rewrTup = get_catalog_object_by_oid(pg_rewrite, objectId); + rewrForm = (Form_pg_rewrite) GETSTRUCT(rewrTup); + + renameStmt = new_objtree_VA("ALTER RULE %{rulename}I ON %{identity}D RENAME TO %{newname}I", + 0); + append_string_object(renameStmt, "rulename", node->subname); + append_object_object(renameStmt, "identity", + new_objtree_for_qualname_id(RelationRelationId, + rewrForm->ev_class)); + relation_close(pg_rewrite, AccessShareLock); + } + break; + + case OBJECT_TRIGGER: + { + HeapTuple trigTup; + Form_pg_trigger trigForm; + Relation pg_trigger; + + pg_trigger = relation_open(TriggerRelationId, AccessShareLock); + trigTup = get_catalog_object_by_oid(pg_trigger, objectId); + trigForm = (Form_pg_trigger) GETSTRUCT(trigTup); + + renameStmt = new_objtree_VA("ALTER TRIGGER %{triggername}I ON %{identity}D RENAME TO %{newname}I", + 0); + append_string_object(renameStmt, "triggername", node->subname); + append_object_object(renameStmt, "identity", + new_objtree_for_qualname_id(RelationRelationId, + trigForm->tgrelid)); + relation_close(pg_trigger, AccessShareLock); + } + break; + + case OBJECT_POLICY: + { + HeapTuple polTup; + Form_pg_policy polForm; + Relation pg_policy; + ScanKeyData key; + SysScanDesc scan; + + pg_policy = relation_open(PolicyRelationId, AccessShareLock); + ScanKeyInit(&key, ObjectIdAttributeNumber, + BTEqualStrategyNumber, F_OIDEQ, + ObjectIdGetDatum(objectId)); + scan = systable_beginscan(pg_policy, PolicyOidIndexId, true, + NULL, 1, &key); + polTup = systable_getnext(scan); + if (!HeapTupleIsValid(polTup)) + elog(ERROR, "cache lookup failed for policy %u", objectId); + polForm = (Form_pg_policy) GETSTRUCT(polTup); + + renameStmt = new_objtree_VA("ALTER POLICY %{if_exists}s %{policyname}I on %{identity}D RENAME TO %{newname}I", + 0); + append_string_object(renameStmt, "policyname", node->subname); + append_object_object(renameStmt, "identity", + new_objtree_for_qualname_id(RelationRelationId, + polForm->polrelid)); + append_string_object(renameStmt, "if_exists", + node->missing_ok ? "IF EXISTS" : ""); + systable_endscan(scan); + relation_close(pg_policy, AccessShareLock); + } + break; + + default: + elog(ERROR, "unsupported object type %d", node->renameType); + } + + append_string_object(renameStmt, "newname", node->newname); + + return renameStmt; +} + static inline ObjElem * deparse_Seq_Cache(ObjTree *parent, Form_pg_sequence seqdata) { @@ -2354,7 +2765,7 @@ deparse_simple_command(StashedCommand *cmd) break; case T_RenameStmt: - elog(ERROR, "unimplemented deparse of %s", CreateCommandTag(parsetree)); + command = deparse_RenameStmt(objectId, parsetree); break; case T_AlterObjectSchemaStmt: -- 2.1.4