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PT-1757 Implemented fallback in NibbleIterator

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Since now NibbleIterator can fallback to nibble (from one chunk) pt-osc
can nibble tables even if due to unacurate stats, it choses one nible as
the initial nibbling method.
This commit is contained in:
Carlos Salguero
2019-10-13 21:58:56 -03:00
parent e58b9fbea8
commit 6a302e2b07
12 changed files with 549 additions and 398 deletions
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7
lib/IndexLength.pm
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@@ -151,8 +151,8 @@ sub _make_range_query {
# we don't want the last column; that's added below.
foreach my $n ( 0..($n_index_cols - 2) ) {
my $col = $index_cols->[$n];
my $val = $vals->[$n];
push @where, $q->quote($col) . " = ?";
my $val = $tbl->{tbl_struct}->{type_for}->{$col} eq 'enum' ? "CAST(? AS UNSIGNED)" : "?";
push @where, $q->quote($col) . " = " . $val;
}
}
@@ -160,7 +160,8 @@ sub _make_range_query {
# the N left-most index columns.
my $col = $index_cols->[$n_index_cols - 1];
my $val = $vals->[-1]; # should only be as many vals as cols
push @where, $q->quote($col) . " >= ?";
my $condition = $tbl->{tbl_struct}->{type_for}->{$col} eq 'enum' ? "CAST(? AS UNSIGNED)" : "?";
push @where, $q->quote($col) . " >= " . $condition;
my $sql = "EXPLAIN SELECT /*!40001 SQL_NO_CACHE */ * "
. "FROM $tbl->{name} FORCE INDEX (" . $q->quote($index) . ") "