Andrey Khitrin created IGNITE-18488:
---------------------------------------
Summary: SQL: SUBSTRING function does not support NULL values
Key: IGNITE-18488
URL: https://issues.apache.org/jira/browse/IGNITE-18488
Project: Ignite
Issue Type: Bug
Components: sql
Affects Versions: 3.0.0-beta1
Reporter: Andrey Khitrin
ANSI99 SQL specification ("6.18 <string value function>") says the following:
{code:java}
3) If <character substring function> is specified, then:
a) Let C be the value of the <character value expression>, ..., and let S be
the value of the <start position>.
b) If <string length> is specified, then let L be the value of <string
length> ...
c) If either C, S, or L is the null value, then the result of the <character
substring function> is the null value.
{code}
So, we should expect the following behavior:
{code:sql}
SUBSTRING('text' FROM 1 FOR NULL) -> NULL
SUBSTRING('text' FROM NULL FOR 2) -> NULL
SUBSTRING(NULL FROM 1 FOR 2) -> NULL
{code}
Instead, we got errors for these queries:
{code:sql}
sql-cli> SELECT SUBSTRING('text' FROM 1 FOR NULL);
SQL query execution error
Exception while executing query [query=SELECT SUBSTRING('text' FROM 1 FOR
NULL);]. Error message:From line 1, column 8 to line 1, column 40: Cannot apply
'SUBSTRING' to arguments of type 'SUBSTRING(<CHAR(4)> FROM <INTEGER> FOR
<NULL>)'. Supported form(s): 'SUBSTRING(<CHAR> FROM <INTEGER>)'
'SUBSTRING(<CHAR> FROM <INTEGER> FOR <INTEGER>)'
'SUBSTRING(<VARCHAR> FROM <INTEGER>)'
'SUBSTRING(<VARCHAR> FROM <INTEGER> FOR <INTEGER>)'
'SUBSTRING(<BINARY> FROM <INTEGER>)'
'SUBSTRING(<BINARY> FROM <INTEGER> FOR <INTEGER>)'
'SUBSTRING(<VARBINARY> FROM <INTEGER>)'
'SUBSTRING(<VARBINARY> FROM <INTEGER> FOR <INTEGER>)'
sql-cli> SELECT SUBSTRING('text' FROM NULL FOR 2);
SQL query execution error
Exception while executing query [query=SELECT SUBSTRING('text' FROM NULL FOR
2);]. Error message:From line 1, column 8 to line 1, column 40: Cannot apply
'SUBSTRING' to arguments of type 'SUBSTRING(<CHAR(4)> FROM <NULL> FOR
<INTEGER>)'. Supported form(s): 'SUBSTRING(<CHAR> FROM <INTEGER>)'
'SUBSTRING(<CHAR> FROM <INTEGER> FOR <INTEGER>)'
'SUBSTRING(<VARCHAR> FROM <INTEGER>)'
'SUBSTRING(<VARCHAR> FROM <INTEGER> FOR <INTEGER>)'
'SUBSTRING(<BINARY> FROM <INTEGER>)'
'SUBSTRING(<BINARY> FROM <INTEGER> FOR <INTEGER>)'
'SUBSTRING(<VARBINARY> FROM <INTEGER>)'
'SUBSTRING(<VARBINARY> FROM <INTEGER> FOR <INTEGER>)'
sql-cli> SELECT SUBSTRING(NULL FROM 1 FOR 2);
(client freezes, no answer at all)
{code}
*Important*: the last query causes {{NullPointerException}} within DB:
{code:java}
2022-12-30 07:32:46:210 +0000
[WARNING][node1-srv-worker-1][ClientInboundMessageHandler] Error processing
client request
java.lang.NullPointerException
at
org.apache.ignite.internal.sql.SqlColumnTypeConverter.columnTypeToClass(SqlColumnTypeConverter.java:42)
at
org.apache.ignite.client.handler.JdbcQueryCursorHandlerImpl.createColumnMetadata(JdbcQueryCursorHandlerImpl.java:162)
at
java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at
java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1655)
at
java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at
java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at
java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
at
java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at
java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
at
org.apache.ignite.client.handler.JdbcQueryCursorHandlerImpl.queryMetadataAsync(JdbcQueryCursorHandlerImpl.java:133)
at
org.apache.ignite.client.handler.requests.jdbc.ClientJdbcQueryMetadataRequest.process(ClientJdbcQueryMetadataRequest.java:47)
at
org.apache.ignite.client.handler.ClientInboundMessageHandler.processOperation(ClientInboundMessageHandler.java:454)
at
org.apache.ignite.client.handler.ClientInboundMessageHandler.processOperation(ClientInboundMessageHandler.java:336)
at
org.apache.ignite.client.handler.ClientInboundMessageHandler.channelRead(ClientInboundMessageHandler.java:187)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at
io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:327)
at
io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:299)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at
io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at
io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at
io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at
io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:722)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:658)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:584)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:496)
at
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:995)
at
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:829)
{code}
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