Adds context to sqlparser errors#5690

Merged

sougou merged 2 commits intovitessio:masterfrom

cmoog:pos_parse_err

Jan 19, 2020

Commits on Jan 13, 2020

adds position and last token context to parse errors
cmoog
committed

Commits on Jan 14, 2020

adds unit tests for PositionedErr parse error
cmoog
committed