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Readability edits to vector matching (#3624) 

* Added L3 headings - makes page a little easier to read

* Made use of right-hand and left-hand consistent
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James Turnbull 2017-12-26 05:28:39 -05:00 committed by Brian Brazil
parent ecc24b554d
commit 380cacd3a4
1 changed files with 11 additions and 7 deletions
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18
docs/querying/operators.md
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@ -34,8 +34,8 @@ is multiplied by 2, the result is another vector in which every sample value of
the original vector is multiplied by 2.
**Between two instant vectors**, a binary arithmetic operator is applied to
each entry in the left-hand-side vector and its [matching element](#vector-matching)
in the right hand vector. The result is propagated into the result vector and the metric
each entry in the left-hand side vector and its [matching element](#vector-matching)
in the right-hand vector. The result is propagated into the result vector and the metric
name is dropped. Entries for which no matching entry in the right-hand vector can be
found are not part of the result.
@ -69,10 +69,10 @@ modifier is provided, vector elements that would be dropped instead have the val
applied to matching entries. Vector elements for which the expression is not
true or which do not find a match on the other side of the expression get
dropped from the result, while the others are propagated into a result vector
with their original (left-hand-side) metric names and label values.
with their original (left-hand side) metric names and label values.
If the `bool` modifier is provided, vector elements that would have been
dropped instead have the value `0` and vector elements that would be kept have
the value `1` with the left-hand-side metric names and label values.
the value `1` with the left-hand side metric names and label values.
### Logical/set binary operators
@ -85,7 +85,7 @@ These logical/set binary operators are only defined between instant vectors:
`vector1 and vector2` results in a vector consisting of the elements of
`vector1` for which there are elements in `vector2` with exactly matching
label sets. Other elements are dropped. The metric name and values are carried
over from the left-hand-side vector.
over from the left-hand side vector.
`vector1 or vector2` results in a vector that contains all original elements
(label sets + values) of `vector1` and additionally all elements of `vector2`
@ -97,9 +97,11 @@ label sets. All matching elements in both vectors are dropped.
## Vector matching
Operations between vectors attempt to find a matching element in the right-hand-side
Operations between vectors attempt to find a matching element in the right-hand side
vector for each entry in the left-hand side. There are two basic types of
matching behavior:
matching behavior: One-to-one and many-to-one/one-to-many.
### One-to-one vector matches
**One-to-one** finds a unique pair of entries from each side of the operation.
In the default case, that is an operation following the format `vector1 <operator> vector2`.
@ -134,6 +136,8 @@ The entries with methods `put` and `del` have no match and will not show up in t
{method="get"} 0.04 // 24 / 600
{method="post"} 0.05 // 6 / 120
### Many-to-one and one-to-many vector matches
**Many-to-one** and **one-to-many** matchings refer to the case where each vector element on
the "one"-side can match with multiple elements on the "many"-side. This has to
be explicitly requested using the `group_left` or `group_right` modifier, where