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Graph/indexable-predicate-mismatch

Pattern

Indexable Predicate Mismatch

indexable-predicate-mismatch

Expression-wrapped or non-indexable predicates (e.g., casting timestamps to DATE, leading-wildcard LIKE, or searching randomized encrypted ciphertext) prevent PostgreSQL from using intended indexes, causing slow scans and degraded query performance.

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Updated6/26/2026

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PostgreSQL does not support LIMIT directly in UPDATE statements. — When implementing batch updates (e.g., promoting memory events from short-term to long-term with a batch cap),. Tension: you need a subquery pattern.

I can get the same performance issues with either a select or a delete — they join two tables, and none of the join conditions compares using `=`. Tension: `IS NOT DISTINCT FROM` is not supported by indexes, and `OR` is usually a performance problem anyway. Outcome: the root of your problem are the NULL values.

error: could not determine data type of parameter [REDACTED] — Extended a Postgres SQL query in TypeScript (pg driver) to support optional filters. Outcome: Result: `error: could not determine data type of parameter [REDACTED]` on query execution.

indexes by Seq Scan — Tried to set db_index=True, HashIndex and BrinIndex. Tension: there are 1000 records in the database. Outcome: 1000 records is very small amount of records.

Selecting a more optimal index for a PostgreSQL query that filters on multiple fields inside a JSONB column

ERROR: function to_date(bytea, unknown) does not exist — on PostgreSQL. Tension: Hint: No function matches the given name and argument types.

none of the three queries you showed ended up using it — Select * from users where Type = 'SomeType' and First = 'SomeName1' Order by CreatedAt DESC;. Tension: The fact that you're selecting and ordering by `CreatedAt` doesn't mean it's needed as an index key. Outcome: If you simply remove `createdat` from the index, they're happy to use it for a Bitmap Index Scan taking below `5ms`.

you get the type mismatch error — merge with PostgreSQL 17.2. Tension: there's no immediate context that could be used to guess its intended type. Outcome: it defaults to `text`.

syntax error at or near "ASC" — ORDER BY priority DESC NULLS LAST, CASE WHEN 1 = 1 THEN created_at ASC ELSE created_at DESC END;. Tension: How can I have `CASE` in the second key of the `ORDER BY`? Outcome: This throws an error.

Postgres gives me no warning after the interval expired. Tension: What is the difference with triggering a check, and this check constraint? Outcome: At any rate, remove the buggy check constraint.

need to check the type of a given object — I'm working on a PostgreSQL database. Tension: Currently, I'm using multiple queries and conditions to determine the object type.

The data will get removed from the index by some future vacuum. — Does PostgreSQL remove values from partial index if conditon is no longer met? Tension: freed up space is only reusable under one of two conditions. Outcome: you would need a REINDEX.

"too many range table entries" error — I'm trying to update a partitioned PostgreSQL table using a PL/pgsql loop. Tension: it contains a self join on a large table. Outcome: If I hardcode the partition to update in the WHERE clauses, it works just fine.

And PostgresHook does not want to work — When substituting in PostgresOperator, everything works out well. Tension: I want to use Templates reference - {{ds}}. Outcome: render the template values explicitly.

An INSERT...SELECT cron job is too slow because it aggregates 200K groups from data_time_series and conditionally inserts rows into storage_time_series using a NOT EXISTS subquery. The conditional existence check becomes a performance bottleneck.

Querying `pg_stat_user_indexes` gives a long list of results with 0 scans — Primary Instance being used for the (transactional) application and a Read Replica being used for analytical purposes. Tension: we are not sure how to interpret those stats regarding the replicas with enough confidence to drop some of the indexes. Outcome: Can they be different in the primary and replica?

Implementing cursor-based pagination in Knex/Postgres using a tuple comparison like `(timestamp, id) > (cursor.timestamp, cursor.id)` fails and returns no rows. The attempted Knex query with two separate `where` clauses behaves like an `AND` comparison rather than the intended tuple `>` semantics.

Trying to find an equivalent in PostgreSQL/EDB for Oracle's ROWID pseudocolumn to uniquely identify a row and use it in queries.

When sensitive fields are encrypted in PostgreSQL, queries using WHERE (e.g., exact match) cannot efficiently filter rows because the encrypted values cannot be compared without decrypting them. This makes encrypted-field searches slow and impractical at scale.

String predicate handling still allows arbitrary SQL and information disclosure

Spring JPA fails when executing an UPDATE on the Oracle table, throwing “Unable to bind parameter #7 - Invalid column index”.

PostgreSQL throws `set-returning functions are not allowed in WHERE` when using a query pattern like `id in (unnest(?))` with a JDBC-provided array parameter.

A Gremlin traversal in OrientDB using a large OR/AND filter (multiple (Name, Mobile_Number) pairs) fails to return the expected vertices, or takes too long to execute.

Pattern matching with instanceof cannot use a primitive boolean operand

Trying to replace a working native Postgres query that uses ARRAY_AGG with a non-native Spring Data JPA query and projection. Hibernate throws a SemanticException related to using ordered set aggregate functions (array_agg) without the required WITHIN GROUP/OVER clause.

PostgreSQL query on a large users table is slow because `LIKE "%@example.com"` does not use the email index

When two migration SQL files share the same index number. Tension: The other file exists on disk but is silently ignored.

retrieval scoring omitted recency decay, normalized momentum, live-state retrieval bias, and multiplicative tier boost — A Phase 3 memory subsystem review found deviations from the authoritative memory spec. Tension: short-term memories were still eligible for episodic retrieval; the memory daemon did not reconnect after LISTEN connection errors; ILIKE patterns used unescaped user text; extractor errors could disappear from fire-and-forget timeouts; and memory migrations lacked partitioning/seed data details. Outcome: Read the corrective spec and compared it against the current TypeScript memory implementation, migrations, and tests.

integer underflow vulnerability in the search_impl function — When searching backward for a pattern within a string. Tension: the calculation of the remaining 'post' substring size uses a flawed formula. Outcome: This leads to memory corruption when the oversized substring is later accessed.

PostgresError: column "duration_ms" of relation "privacy_events" does not exist. Tension: The same root cause manifests two very different ways depending on caller style.

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