/*
* __drop_colgroup --
* WT_SESSION::drop for a colgroup.
*/
static int
__drop_colgroup(
WT_SESSION_IMPL *session, const char *uri, int force, const char *cfg[])
{
WT_BTREE *btree;
WT_TABLE *table;
const char *cgname, *tablename;
size_t tlen;
int i, ret;
tablename = uri;
if (!WT_PREFIX_SKIP(tablename, "colgroup:"))
return (EINVAL);
cgname = strchr(tablename, ':');
if (cgname != NULL) {
tlen = (size_t)(cgname - tablename);
++cgname;
} else
tlen = strlen(tablename);
/*
* Try to get the btree handle. Ideally, we would use an exclusive
* lock here to prevent access to the table while we are dropping it,
* but conflicts with the exclusive lock taken by
* __wt_session_close_any_open_btree. If two threads race dropping
* the same object, it will be caught there.
*
* If we can't get a tree, try to remove it from the schema table.
*/
if ((ret = __wt_schema_get_btree(
session, uri, strlen(uri), cfg, WT_BTREE_NO_LOCK)) != 0) {
(void)__wt_schema_table_remove(session, uri);
return (ret);
}
btree = session->btree;
/* If we can get the table, detach the colgroup from it. */
if ((ret = __wt_schema_get_table(
session, tablename, tlen, &table)) == 0) {
for (i = 0; i < WT_COLGROUPS(table); i++) {
if (table->colgroup[i] == btree) {
table->colgroup[i] = NULL;
table->cg_complete = 0;
break;
}
}
} else if (ret != WT_NOTFOUND)
WT_TRET(ret);
WT_TRET(__drop_tree(session, btree, force));
return (ret);
}
static int
__find_next_col(WT_SESSION_IMPL *session, WT_TABLE *table,
WT_CONFIG_ITEM *colname, int *cgnump, int *colnump, char *coltype)
{
WT_BTREE *cgtree;
WT_CONFIG conf;
WT_CONFIG_ITEM cval, k, v;
WT_DECL_RET;
int cg, col, foundcg, foundcol, getnext;
foundcg = foundcol = -1;
getnext = 1;
for (cgtree = NULL, cg = 0; cg < WT_COLGROUPS(table); cg++) {
WT_RET(__wt_schema_get_btree(session,
table->cg_name[cg], strlen(table->cg_name[cg]),
NULL, 0));
cgtree = session->btree;
/*
* If there is only one column group, we just scan through all
* of the columns. For tables with multiple column groups, we
* look at the key columns once, then go through the value
* columns for each group.
*/
if (cg == 0) {
cval = table->colconf;
col = 0;
} else {
cgcols: WT_ERR(__wt_config_getones(session,
cgtree->config, "columns", &cval));
col = table->nkey_columns;
}
WT_ERR(__wt_config_subinit(session, &conf, &cval));
for (; __wt_config_next(&conf, &k, &v) == 0; col++) {
if (cg == *cgnump && col == *colnump)
getnext = 1;
if (getnext && k.len == colname->len &&
strncmp(colname->str, k.str, k.len) == 0) {
foundcg = cg;
foundcol = col;
getnext = 0;
}
if (cg == 0 && table->ncolgroups > 0 &&
col == table->nkey_columns - 1)
goto cgcols;
}
cgtree = NULL;
WT_ERR(__wt_session_release_btree(session));
}
err: if (cgtree != NULL)
WT_TRET(__wt_session_release_btree(session));
WT_RET(ret);
if (foundcg == -1)
return (WT_NOTFOUND);
*cgnump = foundcg;
if (foundcol < table->nkey_columns) {
*coltype = WT_PROJ_KEY;
*colnump = foundcol;
} else {
*coltype = WT_PROJ_VALUE;
*colnump = foundcol - table->nkey_columns;
}
return (0);
}
