Fix flex warning about default rule

[yixinglu]

What type of PR is this?

• bug
• feature
• enhancement

What does this PR do?

Fixed the warning introduced by #3179

reference: https://stackoverflow.com/questions/1622493/bison-build-warning-s-option-given-but-default-rule-can-be-matched

[jievince]

https://github.com/NebulaGraphMatrix/nebula/pull/new/fix-flex-warning

What's it? It jumps to the current page

[yixinglu]

https://github.com/NebulaGraphMatrix/nebula/pull/new/fix-flex-warning

What's it? It jumps to the current page

👍 fixed

[jievince]

nebula/src/common/time/parser/datetime_scanner.lex

Lines 60 to 64 in cc9e6bf

	}
	. {
	/**
	* Any other unmatched byte sequences will get us here,

I don't know why datetime_scanner.lex hasn't added this rule before line 62:

[ \t\n\r]                      {}

Both scannner.lex and wkt_scanner.lex have it because the last rule . couldn't match `\n'.

[Shylock-Hg]

nebula/src/common/time/parser/datetime_scanner.lex

Lines 60 to 64 in cc9e6bf

	}
	. {
	/**
	* Any other unmatched byte sequences will get us here,

I don't know why datetime_scanner.lex hasn't added this rule before line 62:

[ \t\n\r]                      {}

Both scannner.lex and wkt_scanner.lex have it because the last rule . couldn't match `\n'.

This parser can't ignore these characters directly.

[jievince]

nebula/src/common/time/parser/datetime_scanner.lex

Lines 60 to 64 in cc9e6bf

	}
	. {
	/**
	* Any other unmatched byte sequences will get us here,

I don't know why datetime_scanner.lex hasn't added this rule before line 62:

[ \t\n\r]                      {}

Both scannner.lex and wkt_scanner.lex have it because the last rule . couldn't match `\n'.

This parser can't ignore space directly.

So change the rule to [\t\n\r] {} is also ok.

[yixinglu]

nebula/src/common/time/parser/datetime_scanner.lex

Lines 60 to 64 in cc9e6bf

	}
	. {
	/**
	* Any other unmatched byte sequences will get us here,

I don't know why datetime_scanner.lex hasn't added this rule before line 62:

[ \t\n\r]                      {}

Both scannner.lex and wkt_scanner.lex have it because the last rule . couldn't match `\n'.

This parser can't ignore space directly.

So change the rule to [\t\n\r] {} is also ok.

So could i close this PR ?

[Shylock-Hg]

nebula/src/common/time/parser/datetime_scanner.lex

Lines 60 to 64 in cc9e6bf

	}
	. {
	/**
	* Any other unmatched byte sequences will get us here,

I don't know why datetime_scanner.lex hasn't added this rule before line 62:

[ \t\n\r]                      {}

Both scannner.lex and wkt_scanner.lex have it because the last rule . couldn't match `\n'.

This parser can't ignore space directly.

So change the rule to [\t\n\r] {} is also ok.

So could i close this PR ?

Yes, please review this PR #3461

[Shylock-Hg]

Replace by #3461