Merge pull request #48 from komainu8/release_8.0.0_update_blog_en

blog en: add 8.0.0 entry

en/_posts/2018-02-09-groonga-8.0.0.md

@@ -0,0 +1,210 @@
+---
+layout: post.en
+title: Groonga 8.0.0 has been released
+description: Groonga 8.0.0 has been released!
+published: false
+---
+
+## Groonga 8.0.0 has been released
+
+[Groonga 8.0.0](/docs/news.html#release-8.0.0) has been released!
+
+This is a major version up! But It keeps backward compatibility.
+You can upgrade to 8.0.0 without rebuilding database.
+
+How to install: [Install](/docs/install.html)
+
+### Changes
+
+Here are important changes in this release:
+
+  * [select](/docs/reference/commands/select.html) added `--drilldown_adjuster` and `--drilldowns[label].adjuster`.
+
+  * [between](/docs/reference/functions/between) Accept `between()` without borders.
+
+  * Fixed a memory leak for normal hash table.
+
+### [select](/docs/reference/commands/select.html) added `--drilldown_adjuster` and `--drilldowns[label].adjuster`.
+
+Added `--drilldown_adjuster` and `--drilldowns[LABEL].adjuster` in `select` arguments.
+You can adjust score against result of drilldown.
+
+Specifically, below.
+
+```text
+table_create Categories TABLE_PAT_KEY ShortText
+
+table_create Tags TABLE_PAT_KEY ShortText
+column_create Tags categories COLUMN_VECTOR|WITH_WEIGHT Categories
+
+table_create Memos TABLE_HASH_KEY ShortText
+column_create Memos tags COLUMN_VECTOR Tags
+
+column_create Categories tags_categories COLUMN_INDEX|WITH_WEIGHT \
+  Tags categories
+
+load --table Tags
+[
+{"_key": "groonga", "categories": {"full-text-search": 100}},
+{"_key": "mroonga", "categories": {"mysql": 100, "full-text-search": 80}},
+{"_key": "ruby", "categories": {"language": 100}}
+]
+
+load --table Memos
+[
+{
+  "_key": "Groonga is fast",
+  "tags": ["groonga"]
+},
+{
+  "_key": "Mroonga is also fast",
+  "tags": ["mroonga", "groonga"]
+},
+{
+  "_key": "Ruby is an object oriented script language",
+  "tags": ["ruby"]
+}
+]
+
+select Memos \
+  --limit 0 \
+  --output_columns _id \
+  --drilldown tags \
+  --drilldown_adjuster 'categories @ "full-text-search" * 2 + categories @ "mysql"' \
+  --drilldown_output_columns _key,_nsubrecs,_score
+[
+  [
+    0,
+    0.0,
+    0.0
+  ],
+  [
+    [
+      [
+        3
+      ],
+      [
+        [
+          "_id",
+          "UInt32"
+        ]
+      ]
+    ],
+    [
+      [
+        3
+      ],
+      [
+        [
+          "_key",
+          "ShortText"
+        ],
+        [
+          "_nsubrecs",
+          "Int32"
+        ],
+        [
+          "_score",
+          "Int32"
+        ]
+      ],
+      [
+        "groonga",
+        2,
+        203
+      ],
+      [
+        "mroonga",
+        1,
+        265
+      ],
+      [
+        "ruby",
+        1,
+        0
+      ]
+    ]
+  ]
+]
+```
+
+In the above example, we adjust the score of records that have `full-text-search` or `mysql` in `categories` .
+
+### [between](/docs/reference/functions/between) Accept `between()` without borders.
+
+From this release, `max_border` and `min_border` are now optional.
+If the number of arguments passed to ``between()`` is 3, the 2nd and 3rd arguments are handled as the inclusive edges.
+
+Specifically, below.
+
+```text
+table_create Users TABLE_HASH_KEY ShortText
+column_create Users age COLUMN_SCALAR Int32
+
+table_create Ages TABLE_PAT_KEY Int32
+column_create Ages users_age COLUMN_INDEX Users age
+
+load --table Users
+[
+{"_key": "alice",  "age": 17},
+{"_key": "bob",    "age": 18},
+{"_key": "calros", "age": 19},
+{"_key": "dave",   "age": 20},
+{"_key": "eric",   "age": 21}
+]
+
+select Users --filter 'between(age, 18, 20)'
+[
+  [
+    0,
+    0.0,
+    0.0
+  ],
+  [
+    [
+      [
+        3
+      ],
+      [
+        [
+          "_id",
+          "UInt32"
+        ],
+        [
+          "_key",
+          "ShortText"
+        ],
+        [
+          "age",
+          "Int32"
+        ]
+      ],
+      [
+        2,
+        "bob",
+        18
+      ],
+      [
+        3,
+        "calros",
+        19
+      ],
+      [
+        4,
+        "dave",
+        20
+      ]
+    ]
+  ]
+]
+```
+
+### Fixed a memory leak for normal hash table.
+
+Fixed a bug that you sometimes can not connect to groonga just by continuing to send queries.
+
+### Conclusion
+
+See [Release 8.0.0 2018-02-09](/docs/news.html#release-8.0.0) about detailed changes since 7.1.1
+
+Let's search by Groonga!