Github user ioana-delaney commented on the issue:
https://github.com/apache/spark/pull/17286
@gatorsmile Your example is correct.
Given A J1 B J2 C:
⢠level 0: (A), (B), (C)
⢠level 1: {A, B}, ~{A, C}~, {B, C}
⢠level 3: {A, B, C}
Given A J1 B J2 C cross join D
⢠level 0: (A), (B), (C), (D)
⢠level 1: {A, B}, ~{A, C}~, ~{A, D}~, {B, C}, ~{B, D}~
⢠level 3: {A, B, C}, ~{A, B, D}~, ~{A, C, D}~, ~{B, C, D}~
⢠level 4: {A, B, C, D}
The presence of join conditions between the outer-inner sets are good
heuristics to be used during join enumeration.
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