diff options
Diffstat (limited to 'src/backend/statistics/dependencies.c')
| -rw-r--r-- | src/backend/statistics/dependencies.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/src/backend/statistics/dependencies.c b/src/backend/statistics/dependencies.c index fe9a9ef5de0..0e71f058ad2 100644 --- a/src/backend/statistics/dependencies.c +++ b/src/backend/statistics/dependencies.c @@ -342,8 +342,8 @@ dependency_degree(int numrows, HeapTuple *rows, int k, AttrNumber *dependency, * detects functional dependencies between groups of columns * * Generates all possible subsets of columns (variations) and computes - * the degree of validity for each one. For example with a statistic on - * three columns (a,b,c) there are 9 possible dependencies + * the degree of validity for each one. For example when creating statistics + * on three columns (a,b,c) there are 9 possible dependencies * * two columns three columns * ----------- ------------- @@ -383,8 +383,8 @@ statext_dependencies_build(int numrows, HeapTuple *rows, Bitmapset *attrs, /* * We'll try build functional dependencies starting from the smallest ones * covering just 2 columns, to the largest ones, covering all columns - * included in the statistics. We start from the smallest ones because we - * want to be able to skip already implied ones. + * included in the statistics object. We start from the smallest ones + * because we want to be able to skip already implied ones. */ for (k = 2; k <= numattrs; k++) { @@ -644,7 +644,7 @@ staext_dependencies_load(Oid mvoid) HeapTuple htup = SearchSysCache1(STATEXTOID, ObjectIdGetDatum(mvoid)); if (!HeapTupleIsValid(htup)) - elog(ERROR, "cache lookup failed for extended statistics %u", mvoid); + elog(ERROR, "cache lookup failed for statistics object %u", mvoid); deps = SysCacheGetAttr(STATEXTOID, htup, Anum_pg_statistic_ext_stxdependencies, &isnull); @@ -975,7 +975,7 @@ dependencies_clauselist_selectivity(PlannerInfo *root, return 1.0; } - /* find the best suited statistics for these attnums */ + /* find the best suited statistics object for these attnums */ stat = choose_best_statistics(rel->statlist, clauses_attnums, STATS_EXT_DEPENDENCIES); @@ -986,7 +986,7 @@ dependencies_clauselist_selectivity(PlannerInfo *root, return 1.0; } - /* load the dependency items stored in the statistics */ + /* load the dependency items stored in the statistics object */ dependencies = staext_dependencies_load(stat->statOid); /* |