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MDEV-34041 Display additional information for materialized subqueries in EXPLAIN/ANALYZE FORMAT=JSON
This commits adds the "materialization" block to the output of EXPLAIN/ANALYZE FORMAT=JSON when materialized subqueries are involved into processing. In the case of ANALYZE additional runtime information is displayed, such as: - chosen strategy of materialization - number of partial match/index lookup loops - sizes of partial match buffers
1 parent a5e4c34 commit aae3233

14 files changed

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-615
lines changed

‎mysql-test/include/analyze-format.inc

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,3 +1,3 @@
11
# The time on ANALYSE FORMAT=JSON is rather variable
22

3-
--replace_regex /("(r_[a-z_]*_time_ms|r_buffer_size)": )[^, \n]*/\1"REPLACED"/
3+
--replace_regex /("(r_[a-z_]*_time_ms|r_buffer_size|r_partial_match_buffer_size)": )[^, \n]*/\1"REPLACED"/

‎mysql-test/main/analyze_format_json.result

Lines changed: 17 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -659,20 +659,24 @@ ANALYZE
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},
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"subqueries": [
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{
662-
"query_block": {
663-
"select_id": 2,
664-
"r_loops": 1,
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"r_total_time_ms": "REPLACED",
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"table": {
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"table_name": "t1",
668-
"access_type": "ALL",
662+
"materialization": {
663+
"r_strategy": "index_lookup",
664+
"r_loops": 2,
665+
"query_block": {
666+
"select_id": 2,
669667
"r_loops": 1,
670-
"rows": 2,
671-
"r_rows": 2,
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"r_table_time_ms": "REPLACED",
673-
"r_other_time_ms": "REPLACED",
674-
"filtered": 100,
675-
"r_filtered": 100
668+
"r_total_time_ms": "REPLACED",
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"table": {
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"table_name": "t1",
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"access_type": "ALL",
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"r_loops": 1,
673+
"rows": 2,
674+
"r_rows": 2,
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"r_table_time_ms": "REPLACED",
676+
"r_other_time_ms": "REPLACED",
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"filtered": 100,
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"r_filtered": 100
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}
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}
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}
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}

‎mysql-test/main/derived_cond_pushdown.result

Lines changed: 118 additions & 92 deletions
Original file line numberDiff line numberDiff line change
@@ -7671,10 +7671,12 @@ EXPLAIN
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"filtered": 100,
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"materialized": {
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"unique": 1,
7674-
"query_block": {
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"select_id": 2,
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"table": {
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"message": "Select tables optimized away"
7674+
"materialization": {
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"query_block": {
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"select_id": 2,
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"table": {
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"message": "Select tables optimized away"
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}
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}
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}
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}
@@ -7731,10 +7733,12 @@ EXPLAIN
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"filtered": 100,
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"materialized": {
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"unique": 1,
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"query_block": {
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"select_id": 2,
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"table": {
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"message": "Select tables optimized away"
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"materialization": {
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"query_block": {
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"select_id": 2,
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"table": {
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"message": "Select tables optimized away"
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}
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}
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}
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}
@@ -7815,10 +7819,12 @@ EXPLAIN
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"filtered": 100,
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"materialized": {
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"unique": 1,
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"query_block": {
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"select_id": 3,
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"table": {
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"message": "Select tables optimized away"
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"materialization": {
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"query_block": {
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"select_id": 3,
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"table": {
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"message": "Select tables optimized away"
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}
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}
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}
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}
@@ -7872,10 +7878,12 @@ EXPLAIN
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"filtered": 100,
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"materialized": {
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"unique": 1,
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"query_block": {
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"select_id": 3,
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"table": {
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"message": "Select tables optimized away"
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"materialization": {
7882+
"query_block": {
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"select_id": 3,
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"table": {
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"message": "Select tables optimized away"
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}
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}
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}
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}
@@ -7924,10 +7932,12 @@ EXPLAIN
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"filtered": 100,
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"materialized": {
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"unique": 1,
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"query_block": {
7928-
"select_id": 3,
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"table": {
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"message": "Select tables optimized away"
7935+
"materialization": {
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"query_block": {
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"select_id": 3,
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"table": {
7939+
"message": "Select tables optimized away"
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}
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}
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}
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}
@@ -7976,10 +7986,12 @@ EXPLAIN
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"filtered": 100,
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"materialized": {
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"unique": 1,
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"query_block": {
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"select_id": 3,
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"table": {
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"message": "Select tables optimized away"
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"materialization": {
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"query_block": {
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"select_id": 3,
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"table": {
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"message": "Select tables optimized away"
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}
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}
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}
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}
@@ -8030,10 +8042,12 @@ EXPLAIN
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"filtered": 100,
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"materialized": {
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"unique": 1,
8033-
"query_block": {
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"select_id": 3,
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"table": {
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"message": "Select tables optimized away"
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"materialization": {
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"query_block": {
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"select_id": 3,
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"table": {
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"message": "Select tables optimized away"
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}
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}
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}
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}
@@ -8082,10 +8096,12 @@ EXPLAIN
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"filtered": 100,
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"materialized": {
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"unique": 1,
8085-
"query_block": {
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"select_id": 3,
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"table": {
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"message": "Select tables optimized away"
8099+
"materialization": {
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"query_block": {
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"select_id": 3,
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"table": {
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"message": "Select tables optimized away"
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}
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}
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}
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}
@@ -8134,10 +8150,12 @@ EXPLAIN
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"filtered": 100,
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"materialized": {
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"unique": 1,
8137-
"query_block": {
8138-
"select_id": 3,
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"table": {
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"message": "Select tables optimized away"
8153+
"materialization": {
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"query_block": {
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"select_id": 3,
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"table": {
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"message": "Select tables optimized away"
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}
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}
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}
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}
@@ -8223,10 +8241,12 @@ EXPLAIN
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},
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"subqueries": [
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{
8226-
"query_block": {
8227-
"select_id": 2,
8228-
"table": {
8229-
"message": "Impossible WHERE"
8244+
"materialization": {
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"query_block": {
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"select_id": 2,
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"table": {
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"message": "Impossible WHERE"
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}
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}
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}
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}
@@ -9294,27 +9314,29 @@ EXPLAIN
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"filtered": 100,
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"materialized": {
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"unique": 1,
9297-
"query_block": {
9298-
"select_id": 2,
9299-
"temporary_table": {
9300-
"table": {
9301-
"table_name": "<derived3>",
9302-
"access_type": "ALL",
9303-
"rows": 5,
9304-
"filtered": 100,
9305-
"attached_condition": "d_tab.e > 1",
9306-
"materialized": {
9307-
"query_block": {
9308-
"select_id": 3,
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"filesort": {
9310-
"sort_key": "t2.e",
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"temporary_table": {
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"table": {
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"table_name": "t2",
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"access_type": "ALL",
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"rows": 5,
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"filtered": 100,
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"attached_condition": "t2.e > 1"
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"materialization": {
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"query_block": {
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"select_id": 2,
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"temporary_table": {
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"table": {
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"table_name": "<derived3>",
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"access_type": "ALL",
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"rows": 5,
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"filtered": 100,
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"attached_condition": "d_tab.e > 1",
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"materialized": {
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"query_block": {
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"select_id": 3,
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"filesort": {
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"sort_key": "t2.e",
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"temporary_table": {
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"table": {
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"table_name": "t2",
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"access_type": "ALL",
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"rows": 5,
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"filtered": 100,
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"attached_condition": "t2.e > 1"
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}
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}
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}
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}
@@ -9396,27 +9418,29 @@ EXPLAIN
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"filtered": 100,
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"materialized": {
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"unique": 1,
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"query_block": {
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"select_id": 2,
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"temporary_table": {
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"table": {
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"table_name": "<derived3>",
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"access_type": "ALL",
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"rows": 5,
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"filtered": 100,
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"attached_condition": "d_tab.max_f > 20",
9408-
"materialized": {
9409-
"query_block": {
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"select_id": 3,
9411-
"having_condition": "max_f > 20",
9412-
"filesort": {
9413-
"sort_key": "t2.e",
9414-
"temporary_table": {
9415-
"table": {
9416-
"table_name": "t2",
9417-
"access_type": "ALL",
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"rows": 5,
9419-
"filtered": 100
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"materialization": {
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"query_block": {
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"select_id": 2,
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"temporary_table": {
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"table": {
9426+
"table_name": "<derived3>",
9427+
"access_type": "ALL",
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"rows": 5,
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"filtered": 100,
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"attached_condition": "d_tab.max_f > 20",
9431+
"materialized": {
9432+
"query_block": {
9433+
"select_id": 3,
9434+
"having_condition": "max_f > 20",
9435+
"filesort": {
9436+
"sort_key": "t2.e",
9437+
"temporary_table": {
9438+
"table": {
9439+
"table_name": "t2",
9440+
"access_type": "ALL",
9441+
"rows": 5,
9442+
"filtered": 100
9443+
}
94209444
}
94219445
}
94229446
}
@@ -10826,16 +10850,18 @@ EXPLAIN
1082610850
"attached_condition": "t4.c = `<subquery2>`.`sum(b)`",
1082710851
"materialized": {
1082810852
"unique": 1,
10829-
"query_block": {
10830-
"select_id": 2,
10831-
"having_condition": "`f1(a)` > 1 and `sum(b)` > 123",
10832-
"temporary_table": {
10833-
"table": {
10834-
"table_name": "t1",
10835-
"access_type": "ALL",
10836-
"rows": 3,
10837-
"filtered": 100,
10838-
"attached_condition": "t1.a + 1 > 10"
10853+
"materialization": {
10854+
"query_block": {
10855+
"select_id": 2,
10856+
"having_condition": "`f1(a)` > 1 and `sum(b)` > 123",
10857+
"temporary_table": {
10858+
"table": {
10859+
"table_name": "t1",
10860+
"access_type": "ALL",
10861+
"rows": 3,
10862+
"filtered": 100,
10863+
"attached_condition": "t1.a + 1 > 10"
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}
1083910865
}
1084010866
}
1084110867
}

‎mysql-test/main/explain_json.result

Lines changed: 19 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -574,14 +574,16 @@ EXPLAIN
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"filtered": 100,
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"materialized": {
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"unique": 1,
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"query_block": {
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"select_id": 2,
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"temporary_table": {
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"table": {
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"table_name": "t1",
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"access_type": "ALL",
583-
"rows": 10,
584-
"filtered": 100
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"materialization": {
578+
"query_block": {
579+
"select_id": 2,
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"temporary_table": {
581+
"table": {
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"table_name": "t1",
583+
"access_type": "ALL",
584+
"rows": 10,
585+
"filtered": 100
586+
}
585587
}
586588
}
587589
}
@@ -906,13 +908,15 @@ EXPLAIN
906908
},
907909
"subqueries": [
908910
{
909-
"query_block": {
910-
"select_id": 2,
911-
"table": {
912-
"table_name": "t2",
913-
"access_type": "ALL",
914-
"rows": 2,
915-
"filtered": 100
911+
"materialization": {
912+
"query_block": {
913+
"select_id": 2,
914+
"table": {
915+
"table_name": "t2",
916+
"access_type": "ALL",
917+
"rows": 2,
918+
"filtered": 100
919+
}
916920
}
917921
}
918922
}

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