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doc: Fix Markdown formatting in expression language specification #293

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238bc1e
fix: escape pipe character in expression language documentation
wForget Jul 30, 2026
8ab02c9
add spacing before section dividers
wForget Jul 30, 2026
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6 changes: 4 additions & 2 deletions core-spec/expression_language.md
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Expand Up @@ -389,6 +389,7 @@ is not guaranteed identical across engines.
**Fractional seconds** are available everywhere but the token and precision differ
(Oracle `FF1`–`FF9`, `strftime` `%f`, Java `S`…`SSSSSS`); treat sub-second formatting as
a dialect extension.

---

## String Functions
Expand All @@ -398,7 +399,7 @@ a dialect extension.
| Function | Syntax | Description |
| :---- | :---- | :---- |
| `CONCAT` | `CONCAT(str1, str2, ...)` | Concatenate strings |
| `||` | `str1 || str2` | Concatenation operator |
| `\|\|` | `str1 \|\| str2` | Concatenation operator |

@wForget wForget Jul 30, 2026

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Reference: GFM Spec, §4.10 Tables, Example 200, which explicitly states that pipes can be escaped inside other inline spans and shows `\|` rendering as <code>|</code>.

| `LENGTH` | `LENGTH(str)` | String length in characters |
| `LOWER` | `LOWER(str)` | Convert to lowercase |
| `UPPER` | `UPPER(str)` | Convert to uppercase |
Expand Down Expand Up @@ -664,7 +665,7 @@ expression:
| :---- | :---- | :---- | :---- | :---- | :---- |
| Date truncation | `DATE_TRUNC('month', d)` | `DATE_TRUNC('month', d)` | `DATE_TRUNC(d, MONTH)` | `DATE_TRUNC('month', d)` | `DATE_TRUNC('month', d)` |
| Date add | `DATEADD(day, 7, d)` | `DATEADD(day, 7, d)` | `DATE_ADD(d, INTERVAL 7 DAY)` | `DATE_ADD(d, 7)` | `d + INTERVAL '7 days'` |
| String concat | `CONCAT(a, b)` | `CONCAT(a, b)` | `CONCAT(a, b)` | `CONCAT(a, b)` | `a || b` |
| String concat | `CONCAT(a, b)` | `CONCAT(a, b)` | `CONCAT(a, b)` | `CONCAT(a, b)` | `a \|\| b` |
| Null coalesce | `COALESCE(a, b)` | `COALESCE(a, b)` or `NVL(a, b)` | `COALESCE(a, b)` or `IFNULL(a, b)` | `COALESCE(a, b)` | `COALESCE(a, b)` |
| Current timestamp | `CURRENT_TIMESTAMP` | `CURRENT_TIMESTAMP()` | `CURRENT_TIMESTAMP()` | `CURRENT_TIMESTAMP()` | `CURRENT_TIMESTAMP` |
| Substring | `SUBSTRING(s, start, len)` | `SUBSTR(s, start, len)` | `SUBSTR(s, start, len)` | `SUBSTRING(s, start, len)` | `SUBSTRING(s, start, len)` |
Expand All @@ -674,6 +675,7 @@ expression:
### Dialect-Specific Extensions

Vendors may expose their own feature through extensions, however the default for Ossie should be to pass unknown values through.:

---

## Cross-Reference: Tool Mappings
Expand Down