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Minor perf improvement: use UNION ALL to populate tx_lookup in a single INSERT.

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Richard Newman 2016-08-09 16:56:51 -07:00
parent 6f439e3d1d
commit e892a0437d
1 changed files with 22 additions and 6 deletions
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28
src/datomish/db.cljc
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@ -308,13 +308,29 @@
(<? (<exec ["CREATE INDEX IF NOT EXISTS idx_tx_lookup_added ON tx_lookup (added0)"])))
(p :join
;; Fast, only one table walk: lookup by exact eav.
(p :join-eav
(<? (<exec [(str "INSERT INTO tx_lookup SELECT t.e0, t.a0, t.v0, t.tx0, t.added0 + 2, t.value_type_tag0, t.index_avet0, t.index_vaet0, t.index_fulltext0, t.unique_value0, t.sv, t.svalue_type_tag, d.rowid, d.e, d.a, d.v, d.tx, d.value_type_tag FROM tx_lookup AS t LEFT JOIN datoms AS d ON t.e0 = d.e AND t.a0 = d.a AND t.sv = d.v AND t.svalue_type_tag = d.value_type_tag AND t.sv IS NOT NULL")])))
(<?
(<exec
;; First is fast, only one table walk: lookup by exact eav.
;; Second is slower, but still only one table walk: lookup old value by ea.
["INSERT INTO tx_lookup
;; Slower, but still only one table walk: lookup old value by ea.
(p :join-ea
(<? (<exec [(str "INSERT INTO tx_lookup SELECT t.e0, t.a0, t.v0, t.tx0, t.added0 + 2, t.value_type_tag0, t.index_avet0, t.index_vaet0, t.index_fulltext0, t.unique_value0, t.sv, t.svalue_type_tag, d.rowid, d.e, d.a, d.v, d.tx, d.value_type_tag FROM tx_lookup AS t, datoms AS d WHERE t.sv IS NULL AND t.e0 = d.e AND t.a0 = d.a")]))))
SELECT t.e0, t.a0, t.v0, t.tx0, t.added0 + 2, t.value_type_tag0, t.index_avet0, t.index_vaet0, t.index_fulltext0, t.unique_value0, t.sv, t.svalue_type_tag, d.rowid, d.e, d.a, d.v, d.tx, d.value_type_tag
FROM tx_lookup AS t
LEFT JOIN datoms AS d
ON t.e0 = d.e AND
t.a0 = d.a AND
t.sv = d.v AND
t.svalue_type_tag = d.value_type_tag AND
t.sv IS NOT NULL
UNION ALL
SELECT t.e0, t.a0, t.v0, t.tx0, t.added0 + 2, t.value_type_tag0, t.index_avet0, t.index_vaet0, t.index_fulltext0, t.unique_value0, t.sv, t.svalue_type_tag, d.rowid, d.e, d.a, d.v, d.tx, d.value_type_tag
FROM tx_lookup AS t,
datoms AS d
WHERE t.sv IS NULL AND
t.e0 = d.e AND
t.a0 = d.a
"])))
(p :insert-transaction
(p :insert-transaction-added