SQLFrame: On the "all-types" validation, use char instead of character

[amotl]

Introduction

When submitting a record like this to CrateDB using SQLFrame,

cratedb-examples/by-dataframe/sqlframe/example_types.py

Lines 41 to 61 in 82cb581

	# The record that is inserted into the database.
	RECORD_IN = dict(
	null_integer=None,
	integer=42,
	bigint=42,
	float=42.42,
	double=42.42,
	decimal=42.42,
	bit="01010101",
	bool=True,
	text="foobar",
	character="foo",
	timestamp_tz="1970-01-02T00:00:00+01:00",
	timestamp_notz="1970-01-02T00:00:00",
	ip="127.0.0.1",
	array=["foo", "bar"],
	object={"foo": "bar"},
	geopoint=[85.43, 66.23],
	geoshape="POLYGON ((5 5, 10 5, 10 10, 5 10, 5 5))",
	float_vector=[1.0, 2.0, 3.0],
	)

... it generates SQL statements like this:

SELECT 
  ...
  "integer" AS "integer", 
  "bigint" AS "bigint",
  "float" AS "float", 
  ...

Problem

With an aliasing to char, changed within this patch (instead of character), CrateDB only trips on the "char" AS "char" fragment, but not on others.

psycopg2.errors.InternalError_: line 1:229: no viable alternative at input

SELECT 
  "bool" AS "bool", 
  "text" AS "text", 
  "char" AS'

Most basic reproduction

cr> select 42 as "string";
+---------+
| string |
+---------+
|      42 |
+---------+
SELECT 1 row in set (0.002 sec)

cr> select 42 as "char";
SQLParseException[line 1:14: no viable alternative at input 'select 42 as "char"']

• Aliasing column to "CHAR" does not work, while it works for all other reserved words crate#17108

Traceback

FAILED test.py::test_ddl_dml_dql - psycopg2.errors.InternalError_: line 1:229: no viable alternative at input 'SELECT "null_integer", "integer" AS "integer", "bigint" AS "bigint", "float" AS "float", "double" AS "double", "decimal" AS "decimal", "bit" AS "bit", "bool" AS "bool", "text" AS "text", "char" AS'
CONTEXT:  io.crate.exceptions.SQLExceptions.esToCrateException(SQLExceptions.java:211)
io.crate.exceptions.SQLExceptions.prepareForClientTransmission(SQLExceptions.java:200)
io.crate.protocols.postgres.Messages.sendErrorResponse(Messages.java:195)
io.crate.protocols.postgres.Messages.sendErrorResponse(Messages.java:188)
io.crate.protocols.postgres.PostgresWireProtocol.handleSimpleQuery(PostgresWireProtocol.java:800)
io.crate.protocols.postgres.PostgresWireProtocol$MessageHandler.dispatchMessage(PostgresWireProtocol.java:341)
io.crate.protocols.postgres.PostgresWireProtocol$MessageHandler.dispatchState(PostgresWireProtocol.java:331)
io.crate.protocols.postgres.PostgresWireProtocol$MessageHandler.channelRead0(PostgresWireProtocol.java:299)
io.crate.protocols.postgres.PostgresWireProtocol$MessageHandler.channelRead0(PostgresWireProtocol.java:283)
io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:99)
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346)
io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:318)
io.crate.protocols.postgres.PgDecoder.channelRead(PgDecoder.java:116)
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:93)

-- https://github.com/crate/cratedb-examples/actions/runs/12234558808/job/34124004513?pr=767#step:6:193

References

• Aliasing column to "CHAR" does not work, while it works for all other reserved words crate#17108