Unpatched Multi-Column TopK

[danxuZhang]

According to scripts/patch.sh, it has applied Postgres.patch, but doesn't apply new_pg.patch.

CURRENT_PATH=$(dirname "$0")
SPTAG_PATH="${CURRENT_PATH}/../thirdparty/SPTAG"
(cd $SPTAG_PATH && git apply ../../patch/spann.patch)
HNSW_PATH="${CURRENT_PATH}/../thirdparty/hnsw"
(cd $HNSW_PATH && git apply ../../patch/hnsw.patch)
POSTGRES_PATH="${CURRENT_PATH}/../thirdparty/Postgres"
(cd $POSTGRES_PATH && git apply ../../patch/Postgres.patch)

In new_pg.patchline 306, it called multicol_topk() for multi-column search in PostgresMain.

+                strcpy(result, "select * from multicol_topk('");

However, in Postgres.patch line 438,topk()is called but not multicol_topk() in PostgresMain.

+						strcpy(result, "select topk('");