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SQL: Enhance timestamp escaped literal parsing #52097

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Feb 10, 2020
Merged

SQL: Enhance timestamp escaped literal parsing #52097

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3166b8e
SQL: Enhance timestamp escaped literal parsing
matriv Feb 8, 2020
3e29401
enhance escaped time literal tests
matriv Feb 8, 2020
439c350
Address comments - enhance tests
matriv Feb 8, 2020
cb520d7
fix index out of bounds
matriv Feb 8, 2020
406433f
address comments
matriv Feb 9, 2020
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22 changes: 16 additions & 6 deletions x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/util/DateUtils.java
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.format.DateTimeParseException;

import static java.time.format.DateTimeFormatter.ISO_LOCAL_DATE;
import static java.time.format.DateTimeFormatter.ISO_LOCAL_TIME;
Expand All @@ -32,11 +33,16 @@ public final class DateUtils {
public static final LocalDate EPOCH = LocalDate.of(1970, 1, 1);
public static final long DAY_IN_MILLIS = 60 * 60 * 24 * 1000L;

private static final DateTimeFormatter DATE_TIME_ESCAPED_LITERAL_FORMATTER = new DateTimeFormatterBuilder()
.append(ISO_LOCAL_DATE)
.appendLiteral(" ")
.append(ISO_LOCAL_TIME)
.toFormatter().withZone(UTC);
private static final DateTimeFormatter DATE_TIME_ESCAPED_LITERAL_FORMATTER_WHITESPACE = new DateTimeFormatterBuilder()
.append(ISO_LOCAL_DATE)
.appendLiteral(" ")
.append(ISO_LOCAL_TIME)
.toFormatter().withZone(UTC);
private static final DateTimeFormatter DATE_TIME_ESCAPED_LITERAL_FORMATTER_T_LITERAL = new DateTimeFormatterBuilder()
.append(ISO_LOCAL_DATE)
.appendLiteral("T")
.append(ISO_LOCAL_TIME)
.toFormatter().withZone(UTC);

private static final DateFormatter UTC_DATE_TIME_FORMATTER = DateFormatter.forPattern("date_optional_time").withZone(UTC);
private static final int DEFAULT_PRECISION_FOR_CURRENT_FUNCTIONS = 3;
Expand Down Expand Up @@ -105,7 +111,11 @@ public static ZonedDateTime asDateTime(String dateFormat) {
}

public static ZonedDateTime ofEscapedLiteral(String dateFormat) {
return ZonedDateTime.parse(dateFormat, DATE_TIME_ESCAPED_LITERAL_FORMATTER.withZone(UTC));
try {
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@costin costin Feb 8, 2020 •
edited
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This could be improved by checking whether there's a T separator at its dedicated position (10) in order to select the right parser. This should avoid the fallback in case of an exception.

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The position is not dedicated though as the year can be more than 4 digits.
But I can use lastIndexOf('-')

return ZonedDateTime.parse(dateFormat, DATE_TIME_ESCAPED_LITERAL_FORMATTER_T_LITERAL.withZone(UTC));
} catch (DateTimeParseException e) {
return ZonedDateTime.parse(dateFormat, DATE_TIME_ESCAPED_LITERAL_FORMATTER_WHITESPACE.withZone(UTC));
}
}

public static String toString(ZonedDateTime dateTime) {
Expand Down
10 changes: 7 additions & 3 deletions ...ck/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/parser/EscapedFunctionsTests.java
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Original file line number Diff line number Diff line change
Expand Up @@ -209,14 +209,18 @@ public void testTimeLiteralValidation() {
}

public void testTimestampLiteral() {
Literal l = timestampLiteral("2012-01-01 10:01:02.3456");
String fractionalSecs = randomFrom("", ".1", ".12", ".123", ".1234", ".12345", ".123456",
".1234567", ".12345678", ".123456789");
Literal l = timestampLiteral("2012-01-01 10:01:02" + fractionalSecs);
assertThat(l.dataType(), is(DATETIME));
l = timestampLiteral("2012-01-01T10:01:02" + fractionalSecs);
assertThat(l.dataType(), is(DATETIME));
}

public void testTimestampLiteralValidation() {
ParsingException ex = expectThrows(ParsingException.class, () -> timestampLiteral("2012-01-01T10:01:02.3456"));
ParsingException ex = expectThrows(ParsingException.class, () -> timestampLiteral("2012-01-01_AB 10:01:02.3456"));
assertEquals(
"line 1:2: Invalid timestamp received; Text '2012-01-01T10:01:02.3456' could not be parsed at index 10",
"line 1:2: Invalid timestamp received; Text '2012-01-01_AB 10:01:02.3456' could not be parsed at index 10",
ex.getMessage());
}

Expand Down