[td-225]fix bug in sim.
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@ -1074,7 +1074,7 @@ sql insert into t0 values('2020-1-1 1:4:10', 10);
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sql insert into t1 values('2020-1-1 1:1:2', 2);
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print ===========================>td-4739
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sql select diff(val) from (select derivative(k, 1s, 0) from t1);
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sql select diff(val) from (select derivative(k, 1s, 0) val from t1);
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if $rows != 0 then
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return -1
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endi
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