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MCOL-271 empty strings should not be NULLs (#2794)

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This patch improves handling of NULLs in textual fields in ColumnStore.
Previously empty strings were considered NULLs and it could be a problem
if data scheme allows for empty strings. It was also one of major
reasons of behavior difference between ColumnStore and other engines in
MariaDB family.

Also, this patch fixes some other bugs and incorrect behavior, for
example, incorrect comparison for "column <= ''" which evaluates to
constant True for all purposes before this patch.
This commit is contained in:
Sergey Zefirov
2023-03-30 17:26:45 +01:00
committed by Roman Nozdrin
parent 0ea592da80
commit b53c231ca6
417 changed files with 12459 additions and 3520 deletions
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9
writeengine/xml/we_xmlgenproc.cpp
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@ -325,23 +325,24 @@ bool XMLGenProc::makeColumnData(const CalpontSystemCatalog::TableName& table)
}
// Include NotNull and Default value
const std::string col_defaultValue(col->colType.defaultValue);
const NullString col_defaultValue(col->colType.defaultValue);
if (col->colType.constraintType == execplan::CalpontSystemCatalog::NOTNULL_CONSTRAINT)
{
int notNull = 1;
xmlTextWriterWriteFormatAttribute(fWriter, BAD_CAST xmlTagTable[TAG_NOT_NULL], "%d", notNull);
if (!col_defaultValue.empty())
if (!col_defaultValue.isNull())
{
xmlTextWriterWriteAttribute(fWriter, BAD_CAST xmlTagTable[TAG_DEFAULT_VALUE],
BAD_CAST col_defaultValue.c_str());
BAD_CAST col_defaultValue.unsafeStringRef().c_str());
}
}
else if (col->colType.constraintType == execplan::CalpontSystemCatalog::DEFAULT_CONSTRAINT)
{
idbassert(!col_defaultValue.isNull()); // good enough for now. I have to figure out how to store the null.
xmlTextWriterWriteAttribute(fWriter, BAD_CAST xmlTagTable[TAG_DEFAULT_VALUE],
BAD_CAST col_defaultValue.c_str());
BAD_CAST (col_defaultValue.unsafeStringRef().c_str()));
}
} // end of "if fSysCatRpt"