[#162] Fix pre-commit warnings
Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>
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@ -101,16 +101,16 @@ In a nutshell, a `SELECT` takes a filter result as input and outputs a specific
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Let's see some examples
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```sql
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-- Selects exactly one node from the entire netmap
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SELECT 1 FROM *
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SELECT 1 FROM *
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-- Same as above, but with an identifier for the selection
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SELECT 1 FROM * AS ONE
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SELECT 1 FROM * AS ONE
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-- Selects two nodes from the RedOrBlueNodes filter, such that both selected nodes
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-- Selects two nodes from the RedOrBlueNodes filter, such that both selected nodes
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-- share the same value for the Color attribute, i.e. both red or both blue.
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SELECT 2 IN SAME Color FROM RedOrBlueNodes
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SELECT 2 IN SAME Color FROM RedOrBlueNodes
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-- Selects two nodes from the RedOrBlueNodes filter, such that the selected nodes
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-- Selects two nodes from the RedOrBlueNodes filter, such that the selected nodes
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-- have distinct values for the Color attribute, i.e. one red and one blue.
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-- The selection is also given an identifier.
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SELECT 2 IN DISTINCT Color FROM RedOrBlueNodes AS MyNodes
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@ -173,18 +173,18 @@ In additional to this basic syntax, there are a couple of additional useful opti
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### The policy playground
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> ℹ️ This section assumes you have an up-to-date version of the `frostfs-cli`.
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> ℹ️ This section assumes you have an up-to-date version of the `frostfs-cli`.
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While simple placement policies have predictable results that can be understood at a glance, more complex ones need careful consideration before deployment. In order to simplify understanding a policy's outcome and experimenting while learning, a builtin tool is provided as part of the `frostfs-cli` for this purpose: the policy playground.
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For the remainder of this guide, we will use the policy playground to setup a virtual netmap (that is, one that doesn't require any networking or deployment) and test various policies. In order to visualize this netmap easily, each node will have three attributes: a character, a shape and a color
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For the remainder of this guide, we will use the policy playground to setup a virtual netmap (that is, one that doesn't require any networking or deployment) and test various policies. In order to visualize this netmap easily, each node will have three attributes: a character, a shape and a color
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![Sample Netmap](./image/sample_netmap.svg)
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We can start the policy playground as follows:
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```sh
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$ frostfs-cli container policy-playground
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>
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>
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```
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Since we didn't pass any endpoint, the initial netmap is empty, which we can verify with the `ls` command (to list the nodes in the netmap):
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@ -400,7 +400,7 @@ FILTER Color EQ 'Green' AS GreenNodes
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#### Example #6
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```sql
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REP 1 IN MyNodes
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REP 2
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REP 2
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CBF 2
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SELECT 1 FROM CuteNodes AS MyNodes
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FILTER (Color EQ 'Blue') AND NOT (Shape EQ 'Circle' OR Shape EQ 'Square') AS CuteNodes
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@ -442,4 +442,4 @@ Others:
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- `ls`: list nodes in the current netmap and their attributes
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- `add`: add a node to the current netmap. If it already exists, it will be overwritten.
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- `remove`: remove a node from the current netmap.
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- `eval`: evaluate a placement policy on the current netmap.
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- `eval`: evaluate a placement policy on the current netmap.
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