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Sep 9, 2025
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feat(langchain-community/pgvector): add support for advanced metadata filters in similarity search #8842

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feat(pgvector): add support for advanced metadata filters in similari…
artemkdr Sep 3, 2025
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Improvements:
artemkdr Sep 6, 2025
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refactor(pgvector): add backward compatibile LegacyMetadataFilter and…
artemkdr Sep 7, 2025
0882997
Create honest-tips-wait.md
hntrl Sep 9, 2025
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5 changes: 5 additions & 0 deletions .changeset/honest-tips-wait.md
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@@ -0,0 +1,5 @@
---
"@langchain/community": patch
---

add support for advanced metadata filters in similarity search
69 changes: 64 additions & 5 deletions docs/core_docs/docs/integrations/vectorstores/pgvector.ipynb
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Expand Up @@ -292,34 +292,93 @@
"id": "3ed9d733",
"metadata": {},
"source": [
"The above filter syntax supports exact match, but the following are also supported:\n",
"The above filter syntax supports exact match (numerics, strings or booleans), \n",
"but the following are also supported:\n",
"\n",
"#### Using the `in` operator\n",
"Support numerics, strings and booleans as values.\n",
"\n",
"```json\n",
"{\n",
" \"field\": {\n",
" \"in\": [\"value1\", \"value2\"],\n",
" }\n",
" \"in\": [\"value1\", \"value2\"]\n",
" },\n",
"}\n",
"```\n",
"\n",
"#### Using the `notIn` operator\n",
"Support numerics, strings and booleans as values.\n",
"\n",
"```json\n",
"{\n",
" \"field\": {\n",
" \"notIn\": [\"value1\", \"value2\"],\n",
" \"notIn\": [2, 3, 4]\n",
" }\n",
"}\n",
"```\n",
"\n",
"#### Using the `arrayContains` operator\n",
"Support numerics, strings and booleans as values.\n",
"\n",
"```json\n",
"{\n",
" \"field\": {\n",
" \"arrayContains\": [\"value1\", \"value2\"]\n",
" }\n",
"}\n",
"```\n",
"\n",
"#### Using the `lt` operator \n",
"Supports numerics only.\n",
"\n",
"```json\n",
"{\n",
" \"field\": {\n",
" \"lt\": 100\n",
" }\n",
"}\n",
"```\n",
"\n",
"#### Using the `lte` operator \n",
"Supports numerics only.\n",
"\n",
"```json\n",
"{\n",
" \"field\": {\n",
" \"lte\": 100\n",
" }\n",
"}\n",
"```\n",
"\n",
"#### Using the `gt` operator \n",
"Supports numerics only.\n",
"\n",
"```json\n",
"{\n",
" \"field\": {\n",
" \"gt\": 100\n",
" }\n",
"}\n",
"```\n",
"\n",
"#### Using the `gte` operator \n",
"Supports numerics only.\n",
"\n",
"```json\n",
"{\n",
" \"field\": {\n",
" \"gte\": 100\n",
" }\n",
"}\n",
"```\n",
"\n",
"#### Using the `neq` operator \n",
"Support numerics, strings and booleans as values, checks that \"field\" doesn't exist or not equal \"value1\".\n",
"\n",
"```json\n",
"{\n",
" \"field\": {\n",
" \"arrayContains\": [\"value1\", \"value2\"],\n",
" \"neq\": \"value1\"\n",
" }\n",
"}\n",
"```\n",
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