#include "xf_database/hash_join_v4.hpp"
template < int KEYW, int PW, int S_PW, int B_PW, int HASHWH, int HASHWL, int HASHO, int ARW, int CH_NM, int BF_HASH_NM, int BFW, int EN_BF > static void hashBuildProbeV4 ( bool& build_probe_flag, hls::stream <ap_uint <KEYW>> k0_strm_arry [CH_NM], hls::stream <ap_uint <PW>> p0_strm_arry [CH_NM], hls::stream <bool> e0_strm_arry [CH_NM], ap_uint <64>* htb0_buf, ap_uint <64>* htb1_buf, ap_uint <64>* htb2_buf, ap_uint <64>* htb3_buf, ap_uint <64>* htb4_buf, ap_uint <64>* htb5_buf, ap_uint <64>* htb6_buf, ap_uint <64>* htb7_buf, ap_uint <64>* stb0_buf, ap_uint <64>* stb1_buf, ap_uint <64>* stb2_buf, ap_uint <64>* stb3_buf, ap_uint <64>* stb4_buf, ap_uint <64>* stb5_buf, ap_uint <64>* stb6_buf, ap_uint <64>* stb7_buf, hls::stream <ap_uint <32>>& pu_begin_status_strms, hls::stream <ap_uint <32>>& pu_end_status_strms, hls::stream <ap_uint <KEYW+S_PW+B_PW>>& j_strm, hls::stream <bool>& j_e_strm )
Hash-Build-Probe v4 primitive. Compared with HashBuildProbeV3 , it enables bloom filter to reduce redundant access to HBM which can further reduce run-time of hash join. Build and probe are separately performed and controlled by a boolean flag. Mutiple build and probe are also provided, and it should make sure all rows in build phase can be stored temporarily in HBM to maintain correctness.
The maximum size of small table is 256MBx8=2GB in this design. The total hash entries is equal to 1<<(HASHWH + HASHWL), and it is limitied to maximun of 1M entries because of the size of URAM in a single SLR.
Parameters:
| KEYW | width of key, in bit. |
| PW | width of max payload, in bit. |
| S_PW | width of payload of small table. |
| B_PW | width of payload of big table. |
| HASHWH | number of hash bits used for PU/buffer selection, 1~3. |
| HASHWL | number of hash bits used for hash-table in PU. |
| HASHO | number of hash bits used for overflow hash counter, 8-12. |
| ARW | width of address, log2(small table max num of rows). |
| CH_NM | number of input channels, 1,2,4. |
| BF_HASH_NM | number of hash functions in bloom filter, 1,2,3. |
| BFW | bloom-filter hash width. |
| EN_BF | bloom-filter switch, 0 for off, 1 for on. |
| build_probe_flag | 0:build 1:probe |
| k0_strm_arry | input of key columns of both tables. |
| p0_strm_arry | input of payload columns of both tables. |
| e0_strm_arry | input of end signal of both tables. |
| htb0_buf | HBM/DDR buffer of hash_table0 |
| htb1_buf | HBM/DDR buffer of hash_table1 |
| htb2_buf | HBM/DDR buffer of hash_table2 |
| htb3_buf | HBM/DDR buffer of hash_table3 |
| htb4_buf | HBM/DDR buffer of hash_table4 |
| htb5_buf | HBM/DDR buffer of hash_table5 |
| htb6_buf | HBM/DDR buffer of hash_table6 |
| htb7_buf | HBM/DDR buffer of hash_table7 |
| stb0_buf | HBM/DDR buffer of PU0 |
| stb1_buf | HBM/DDR buffer of PU1 |
| stb2_buf | HBM/DDR buffer of PU2 |
| stb3_buf | HBM/DDR buffer of PU3 |
| stb4_buf | HBM/DDR buffer of PU4 |
| stb5_buf | HBM/DDR buffer of PU5 |
| stb6_buf | HBM/DDR buffer of PU6 |
| stb7_buf | HBM/DDR buffer of PU7 |
| pu_begin_status_strms | contains build ID, probe ID, fixed hash depth, joined number of last probe and start addr of unused stb_buf for each PU |
| pu_end_status_strms | returns next build ID, next probe ID, fixed hash depth, joined number of current probe and end addr of stb_buf for each PU |
| j_strm | output of joined rows. |
| j_e_strm | is the end flag of joined result. |