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[dev-docs] Fix expression string syntax (#101419)

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Because this isn't in a code block, MDX is trying to interpolate the
`{column1}` value, which is undefined.
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Greg Back 2021-06-04 16:02:33 -04:00 • committed by GitHub
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13
dev_docs/tutorials/expressions.mdx
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@ -9,23 +9,24 @@ tags: ['kibana', 'onboarding', 'dev', 'architecture']
## Expressions service
Expression service exposes a registry of reusable functions primary used for fetching and transposing data and a registry of renderer functions that can render data into a DOM element.
Adding functions is easy and so is reusing them. An expression is a chain of functions with provided arguments, which given a single input translates to a single output.
Expression service exposes a registry of reusable functions primary used for fetching and transposing data and a registry of renderer functions that can render data into a DOM element.
Adding functions is easy and so is reusing them. An expression is a chain of functions with provided arguments, which given a single input translates to a single output.
Each expression is representable by a human friendly string which a user can type.
### creating expressions
Here is a very simple expression string:
essql 'select column1, column2 from myindex' | mapColumn name=column3 fn='{ column1 + 3 }' | table
```
essql 'select column1, column2 from myindex' | mapColumn name=column3 fn='{ column1 + 3 }' | table
```
It consists of 3 functions:
- essql which runs given sql query against elasticsearch and returns the results
- `mapColumn`, which computes a new column from existing ones;
- `table`, which prepares the data for rendering in a tabular format.
The same expression could also be constructed in the code:
```ts
@ -61,7 +62,7 @@ In addition, on the browser side, there are two additional ways to run expressio
#### React expression renderer component
This is the easiest way to get expressions rendered inside your application.
This is the easiest way to get expressions rendered inside your application.
```ts
<ReactExpressionRenderer expression={expression} />