dhermes

Transforming {} to []

$ python transformed.py
{'points': []}
{'points': []}
`grid3` failed as expected
{'points': [{'x': 3, 'y': 4}]}
{'points': [{'x': 3, 'y': 4}, {'x': 5, 'y': 12}]}
`grid6` failed as expected

dhermes

Region / location in gcloud

All gcloud config fields involving region / location

Via https://cloud.google.com/sdk/gcloud/reference/topic/configurations

ai_platform/region
ai/region
artifacts/location

dhermes

Guts of sql.Tx <-> pgx.Tx

Placeholder

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CREATE TABLE foo (
  id INTEGER PRIMARY KEY,
  v1 INTEGER NOT NULL,
  v2 INTEGER NOT NULL,
  v3 INTEGER NOT NULL
);

ALTER TABLE foo
  ADD CONSTRAINT uniq_except_v3_zero
  EXCLUDE USING GIST (v1 WITH =, v2 WITH =, v3 WITH =) WHERE (v3 <> 0);

dhermes

Came up in hardfinhq/go-date#13

Consider

package main

import (
	"fmt"
	"os"

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/1930s.html
/1960s.html
/1970s.html
/1980s.html
/1990s.html
/2000s.html
/2010s.html

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import graphql.language
import networkx as nx
import tabulate


def _find_field_fragment_dependencies(
    field_node: graphql.language.ast.FieldNode,
) -> list[str]:
    if field_node.selection_set is None:
        return []

dhermes

Subtleties of Go JSON marshaling and null / nil

The TL;DR here is that if the standard encoding/json machinery in Go sees a null in a JSON field or a nil pointer in a Go field (of type *T), then it will not invoke the UnmarshalJSON() / MarshalJSON() on your type.

$ go run ./main.go
t1 = main.T{Shift:(*main.Point)(nil)} (nil stays nil, UnmarshalJSON() not invoked)

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# Copyright (c) 2023 - Present. Hardfin, Inc. All rights reserved.
# Hardfin Confidential - Restricted

import csv
import io
import pathlib
import subprocess
import tempfile

dhermes

The problem with "as-of-now" computed columns

The below illustrates why only actually IMMUTABLE functions should be used for PostgreSQL generated columns.

Basic status

Using a function that incorporates the current time, we can generate a status based on the value of a given timestamp: