Closes #1006. Fixes edge cases in foverlaps on numeric types.

README.md

@@ -105,6 +105,8 @@
 
   27. Rolling joins with `-Inf` and `Inf` are handled properly. Closes [#1007](https://github.com/Rdatatable/data.table/issues/1007). Thanks to @tdhock for filing [#1006](https://github.com/Rdatatable/data.table/issues/1006) which lead to the discovery of this issue.
 
+  28. Overlapping range joins with `-Inf` and `Inf` and 0.0 in them are handled properly now. Closes [#1006](https://github.com/Rdatatable/data.table/issues/1006). Thanks to @tdhock for filing the issue with a nice reproducible example.
+
 #### NOTES
 
   1. Clearer explanation of what `duplicated()` does (borrowed from base). Thanks to @matthieugomez for pointing out. Closes [#872](https://github.com/Rdatatable/data.table/issues/872).

inst/tests/tests.Rraw

@@ -5786,6 +5786,14 @@ test(1470.1, DT[J(c(2,-Inf,5,Inf)), roll=Inf], data.table(x=c(2,-Inf,5,Inf), y=c
 test(1470.2, DT[J(c(2,-Inf,5,Inf)), roll=10], data.table(x=c(2,-Inf,5,Inf), y=INT(c(NA, 1, 2, 3))))
 test(1470.3, DT[SJ(c(2,-Inf,5,Inf)), roll=Inf], data.table(x=c(-Inf,2,5,Inf), y=c(1, 1, 2, 3), key="x"))
 
+# 1006, second bug with -Inf, now that #1007 is fixed.
+x <- c(-Inf, -0.1, 0, 0.1, Inf)
+n <- length(x)
+dt.ref <- data.table(start=x[-n], end=x[-1], key=c("start", "end"))
+dt.query <- data.table(q1=c(-0.2, -0.05, 0.05, 0.15), q2=c(-0.2, -0.05, 0.05, 0.15), key=c("q1", "q2"))
+test(1471, foverlaps(dt.query, dt.ref), data.table(dt.ref, dt.query, key=c("q1", "q2")))
+
+
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