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Original file line number | Diff line number | Diff line change |
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/* | ||
* Multi-line comment | ||
*/ | ||
#option ('slidingJoins', true); | ||
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namesRecord := | ||
RECORD | ||
string20 surname; | ||
string10 forename; | ||
integer2 age; | ||
integer2 dadAge; | ||
integer2 mumAge; | ||
END; | ||
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namesRecord2 := | ||
record | ||
string10 extra; | ||
namesRecord; | ||
end; | ||
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namesTable := dataset('x',namesRecord,FLAT); | ||
namesTable2 := dataset('y',namesRecord2,FLAT); | ||
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integer2 aveAgeL(namesRecord l) := (l.dadAge+l.mumAge)/2; | ||
integer2 aveAgeR(namesRecord2 r) := (r.dadAge+r.mumAge)/2; | ||
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// Standard join on a function of left and right | ||
output(join(namesTable, namesTable2, aveAgeL(left) = aveAgeR(right))); | ||
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//Several simple examples of sliding join syntax | ||
output(join(namesTable, namesTable2, left.age >= right.age - 10 and left.age <= right.age +10)); | ||
output(join(namesTable, namesTable2, left.age between right.age - 10 and right.age +10)); | ||
output(join(namesTable, namesTable2, left.age between right.age + 10 and right.age +30)); | ||
output(join(namesTable, namesTable2, left.age between (right.age + 20) - 10 and (right.age +20) + 10)); | ||
output(join(namesTable, namesTable2, aveAgeL(left) between aveAgeR(right)+10 and aveAgeR(right)+40)); | ||
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//Same, but on strings. Also includes age to ensure sort is done by non-sliding before sliding. | ||
output(join(namesTable, namesTable2, left.surname between right.surname[1..10]+'AAAAAAAAAA' and right.surname[1..10]+'ZZZZZZZZZZ' and left.age=right.age)); | ||
output(join(namesTable, namesTable2, left.surname between right.surname[1..10]+'AAAAAAAAAA' and right.surname[1..10]+'ZZZZZZZZZZ' and left.age=right.age,all)); | ||
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//This should not generate a self join | ||
output(join(namesTable, namesTable, left.age between right.age - 10 and right.age +10)); |