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Fix multi-column index nibbling. Remove extra spaces in generated statements.

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This commit is contained in:
Daniel Nichter
2011-09-12 08:14:57 -06:00
parent 3ed822e8e6
commit 0f05ca9b94
2 changed files with 36 additions and 18 deletions
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33
lib/NibbleIterator.pm
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@@ -55,6 +55,7 @@ sub new {
index => $index,
asc_only => 1,
);
MKDEBUG && _d('Ascend params:', Dumper($asc));
# Make SQL statements, prepared on first call to next(). FROM and
# ORDER BY are the same for all statements. FORCE IDNEX and ORDER BY
@@ -65,20 +66,21 @@ sub new {
# These statements are only executed once, so they don't use sths.
my $first_lb_sql
= "SELECT /*!40001 SQL_NO_CACHE */ "
. join(', ', map { $q->quote($_) } @{$index_cols})
. " FROM $from "
. join(', ', map { $q->quote($_) } @{$asc->{scols}})
. " FROM $from"
. ($args{where} ? " WHERE $args{where}" : '')
. " ORDER BY $order_by "
. " ORDER BY $order_by"
. " LIMIT 1"
. " /*first lower boundary*/";
MKDEBUG && _d('First lower boundary statement:', $first_lb_sql);
my $last_ub_sql
= "SELECT /*!40001 SQL_NO_CACHE */ "
. join(', ', map { $q->quote($_) } @{$index_cols})
. " FROM $from "
. join(', ', map { $q->quote($_) } @{$asc->{scols}})
. " FROM $from"
. ($args{where} ? " WHERE $args{where}" : '')
. " ORDER BY $order_by DESC "
. " ORDER BY "
. join(' DESC, ', map {$q->quote($_)} @{$index_cols}) . ' DESC'
. " LIMIT 1"
. " /*last upper boundary*/";
MKDEBUG && _d('Last upper boundary statement:', $last_ub_sql);
@@ -92,7 +94,7 @@ sub new {
# the upper boundary for the current nibble *and* the lower boundary
# for the next nibble. See _next_boundaries().
my $ub_sql = _make_ub_sql(
cols => $index_cols,
cols => $asc->{scols},
from => $from,
where => $asc->{boundaries}->{'>='}
. ($args{where} ? " AND ($args{where})" : ''),
@@ -107,7 +109,7 @@ sub new {
= ($args{dms} ? "$args{dms} " : "SELECT ")
. ($args{select} ? $args{select}
: join(', ', map { $q->quote($_) } @{$asc->{cols}}))
. " FROM $from "
. " FROM $from"
. " WHERE " . $asc->{boundaries}->{'>='} # lower boundary
. " AND " . $asc->{boundaries}->{'<='} # upper boundary
. ($args{where} ? " AND ($args{where})" : '')
@@ -119,7 +121,7 @@ sub new {
= "EXPLAIN SELECT "
. ($args{select} ? $args{select}
: join(', ', map { $q->quote($_) } @{$asc->{cols}}))
. " FROM $from "
. " FROM $from"
. " WHERE " . $asc->{boundaries}->{'>='} # lower boundary
. " AND " . $asc->{boundaries}->{'<='} # upper boundary
. ($args{where} ? " AND ($args{where})" : '')
@@ -133,7 +135,7 @@ sub new {
= ($args{dms} ? "$args{dms} " : "SELECT ")
. ($args{select} ? $args{select}
: join(', ', map { $q->quote($_) } @{$asc->{cols}}))
. " FROM $from "
. " FROM $from"
. ($args{where} ? " AND ($args{where})" : '')
. " ORDER BY $order_by"
. " /*one nibble*/";
@@ -143,7 +145,7 @@ sub new {
= "EXPLAIN SELECT "
. ($args{select} ? $args{select}
: join(', ', map { $q->quote($_) } @{$asc->{cols}}))
. " FROM $from "
. " FROM $from"
. ($args{where} ? " AND ($args{where})" : '')
. " ORDER BY $order_by"
. " /*explain one nibble*/";
@@ -153,7 +155,6 @@ sub new {
%args,
asc => $asc,
index => $index,
index_cols => $index_cols,
from => $from,
order_by => $order_by,
first_lb_sql => $first_lb_sql,
@@ -259,7 +260,7 @@ sub set_chunk_size {
MKDEBUG && _d('Setting new chunk size (LIMIT):', $limit);
$self->{ub_sql} = _make_ub_sql(
cols => $self->{index_cols},
cols => $self->{asc}->{scols},
from => $self->{from},
where => $self->{asc}->{boundaries}->{'>='}
. ($self->{where} ? " AND ($self->{where})" : ''),
@@ -289,9 +290,9 @@ sub _make_ub_sql {
my $ub_sql
= "SELECT /*!40001 SQL_NO_CACHE */ "
. join(', ', map { $q->quote($_) } @{$cols})
. " FROM $from "
. " WHERE $where "
. " ORDER BY $order_by "
. " FROM $from"
. " WHERE $where"
. " ORDER BY $order_by"
. " LIMIT 2 OFFSET " . ((int($limit) || 1) - 1)
. " /*upper boundary*/";
MKDEBUG && _d('Upper boundary statement:', $ub_sql);