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There were a few changes 10.3 in sql_yacc.yy that increased the amout of shift/reduce conflicts.
We need to cleanup the grammar, trying to change the %expect value back to around 102.
The commits that changed %expect recently:
commit f1bd02d99416649717c1f73d9f44b3474736f192
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Author: Aleksey Midenkov <midenok@gmail.com>
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Date: Fri Feb 16 19:07:32 2018 +0100
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MDEV-15004 parser greedily parses AS OF TIMESTAMP
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* TIMESTAMP precedence fixed.
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-%expect 125
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+%expect 139
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commit 9fa715b84d68d5089bae3bfcfda060da816339e0
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Author: Sergei Golubchik <serg@mariadb.org>
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Date: Thu Jan 18 06:28:37 2018 +0300
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MDEV-14798 Add, drop system versioning semantic and syntax
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SQL: DROP PERIOD FOR SYSTEM_TIME syntax
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and remove ER_VERS_SYS_FIELD_EXISTS
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originally by: Eugene Kosov
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-%expect 123
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+%expect 125
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commit 617e108fb6e2bc24e5c9badb94e7d8eaa65d8851
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Author: Sergei Golubchik <serg@mariadb.org>
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Date: Sat Dec 16 21:33:43 2017 +0100
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s/TRUNCATE ... TO/DELETE HISTORY FROM ... BEFORE/
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-%expect 122
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+%expect 123
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commit ca6454bcfe2da8f2a639ae6cf223b626ad116100
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Author: Sergei Golubchik <serg@mariadb.org>
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Date: Mon Dec 11 14:09:58 2017 +0100
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for now, remove FOR SYSTEM_TIME at the end of the query
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non-standard, redundant, potentially risky in the future,
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hides bugs. See #383, #384, #385
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Fixed a parser bug where
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SELECT * FROM (t1 join t2) FOR SYSTEM_TIME ...
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was not an error.
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-%expect 125
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+%expect 122
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commit 79dd77e6aebc861b82e4895941224bbbad441650
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Merge: b7cd182 8f581e8
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Author: Aleksey Midenkov <midenok@gmail.com>
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Date: Mon Dec 11 15:43:41 2017 +0300
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System Versioning 1.0 pre3
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Merge branch '10.3' into trunk
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- %expect 123
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-%expect 104
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++%expect 125
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commit ea1ccfa5000c7f5d01895e3474b2929eee52e2e8
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Author: Sergei Golubchik <serg@mariadb.org>
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Date: Sat Dec 2 16:23:16 2017 +0100
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SQL: regression fix: make NOW a valid identifier again [#363]
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* again, as in 10.2, NOW is a keyword only if followed by parentheses
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* use AS OF CURRENT_TIMESTAMP or AS OF NOW()
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* AS OF CURRENT_TIMESTAMP and AS OF NOW() mean AS OF NOW(6),
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not AS OF NOW(0), (same behavior as in a DEFAULT clause)
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-%expect 124
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+%expect 123
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commit 3198bc839da3259c277d2f80ed698a84d683d496
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Author: Sergei Golubchik <serg@mariadb.org>
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Date: Tue Nov 28 16:38:58 2017 +0100
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Parser: unreserve keywords
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SELECT * FROM t1 FOR SYSTEM_TIME AS OF ...
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becomes ambiguous, but it's the same as with
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SELECT ... UNION SELECT ... ORDER BY ...
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-%expect 117
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+%expect 124
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commit 01a8bad897abcc1445d98886bfdfff7a2b2d1530
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Author: Eugene Kosov <claprix@yandex.ru>
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Date: Sat Nov 25 18:04:14 2017 +0300
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SQL: allow PERIOD as identifier [fixes #331]
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-%expect 115
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+%expect 117
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commit d8d725101992d50b00edf149e7ccd7f720b850dc
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Merge: 835cbbc ce66d5b
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Author: Aleksey Midenkov <midenok@gmail.com>
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Date: Tue Nov 7 00:37:49 2017 +0300
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System Versioning pre0.12
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Merge remote-tracking branch 'origin/archive/2017-10-17' into 10.3
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- %expect 102
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-%expect 116
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++%expect 115
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Summary for earlier changes:
78a891c87bcc584e28fad3a0c0fc7d791bc93ae4 -> 102
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17a87d606302b55d547104d7fe6c536c6c288a8b -> 103
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9073f9fd7da80752c4fcb7c6bed1d51b4853d3ce -> 102
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1b4f0962c14b3c827553e2a470c82afc419f9352 -> 103
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f6a7c1c75ac68dbd23c0666bf586126c2e5b3617 -> 102
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7e66a24dfb381290d59786c36e1dc478ad365bd1 -> 104
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c0a59b46be5be341bd6ffc9fe188a236ced46522 -> 123
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