diff --git a/slides/cse4562sp2018/2018-02-12-Algorithms.html b/slides/cse4562sp2018/2018-02-12-Algorithms.html
index 05d59ccc..03f6c8f8 100644
--- a/slides/cse4562sp2018/2018-02-12-Algorithms.html
+++ b/slides/cse4562sp2018/2018-02-12-Algorithms.html
@@ -216,7 +216,15 @@
return result
- Need to evaluate rhs iterator once per record in lhs
+
+
+
+
+
+ Problem: We need to evaluate rhs iterator
once per record in lhs
- Join Conditions
+ How big should the blocks be?
+
+ What is the IO complexity of the algorithm?
+
+
+ Join Conditions
+
+ Problem: Naively, any tuple matches any other
+
+
+
+ Join Conditions
+
+ Solution: First organize the data
+
+
+
+
+
+
+
+ Strategies
+
+
+ - Sort/Merge Join
+ - Sort all of the data upfront, then scan over both sides.
+
+ - In-Memory Index Join (1-pass Hash; Hash Join)
+ - Build an in-memory index on one table, scan the other.
+
+ - Partition Join (2-pass Hash; External Hash Join)
+ - Partition both sides so that tuples don't join across partitions.
+
+
+
+
+
+
+ Hash Functions
+
+
+
+ - A hash function is a function that maps a large data value to a small fixed-size value
+ - Typically is deterministic & pseudorandom
+
+ - Used in Checksums, Hash Tables, Partitioning, Bloom Filters, Caching, Cryptography, Password Storage, …
+ - Examples: MD5, SHA1, SHA2
+ - MD5() part of OpenSSL (on most OSX / Linux / Unix)
+
+ - Can map h(k) to range [0,N) with h(k) % N (modulus)
+
+
+
+
+ Hash Functions
+
+
+ $$h(X) \mod N$$
+
+
+ - Pseudorandom output between $[0, N)$
+ - Always the same output for a given $X$
+
+
+
+
+
+
+
+
+
+ Why is it important that the hash function is pseudorandom?
+
+
+
+
+ Next Class
+ More operators, More algorithms
diff --git a/slides/cse4562sp2018/graphics/2018-02-12-Join-1PassHash.svg b/slides/cse4562sp2018/graphics/2018-02-12-Join-1PassHash.svg
new file mode 100644
index 00000000..8fa80c73
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+++ b/slides/cse4562sp2018/graphics/2018-02-12-Join-1PassHash.svg
@@ -0,0 +1,430 @@
+
+
+
+
diff --git a/slides/cse4562sp2018/graphics/2018-02-12-Join-2PassHash.svg b/slides/cse4562sp2018/graphics/2018-02-12-Join-2PassHash.svg
new file mode 100644
index 00000000..d254f98f
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@@ -0,0 +1,608 @@
+
+
+
+
diff --git a/slides/cse4562sp2018/graphics/2018-02-12-Join-BNLJ.svg b/slides/cse4562sp2018/graphics/2018-02-12-Join-BNLJ.svg
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+
+
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diff --git a/slides/cse4562sp2018/graphics/2018-02-12-Join-NLJ.svg b/slides/cse4562sp2018/graphics/2018-02-12-Join-NLJ.svg
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